Amount of payable to the manager, a related party, for base management fees, performance fees, if any, out of pocket expenses and any current liabilities due to manager. Due To Manager Related Party Due to manager-related party Total amount of the interest portion on equipment lease earned during the period. Financing Equipment Lease Income Net Financing and equipment lease income Financing and equipment lease income Amount of base management fees and performance fees, if any, incurred by the company for the period to its manager, a related party. Fees To Manager Related Party Fees to manager-related party Fees to manager-related party International Matex Tank Terminals [Member] International Matex Tank Terminals [Member] IMTT [Member] IMTT [Member] Tabular disclosure of payment of cash dividends to manager, related party, during an accounting period. Schedule Of Dividends Paid To Manager Related Party [Table Text Block] Schedule of Dividends Paid to Manager The number of common shares that remain unissued by an entity's charter and bylaws under Dividend Reinvestment Plan. Common Stock Shares Dividend Reinvestment Plan Unissued Shares, unissued under Dividend Reinvestment Plan Common Stock, Votes per share Common Stock Votes Per Share Number of votes for each outstanding share of the Company The maximum number of common shares permitted to be issued by an entity's charter and bylaws under Dividend Reinvestment Plan. Common Stock Shares Dividend Reinvestment Plan Authorized Shares, authorized under Dividend Reinvestment Plan Number of marine terminals Number Of Marine Terminals Number of marine terminals Amendment Flag Amendment Flag The number of shares of the company held by the manager, a related party, for the period. Number of Shares Held by Manager Related Party Shares of the Company held by Manager, a related party Macquarie Infrastructure Management Incorporated [Member] Macquarie Infrastructure Management Incorporated [Member] Macquarie Infrastructure Management (USA) Inc. [Member] Number of Airports Number Of Airports Number of Airport Locations Number of FBO Number of wind power generation facilities. Number of Wind Power Generation Facilities Number of wind power generation facilities Number of Solar projects Number Of Solar Projects Number of solar projects Total Stockholders' Accumulated Other Comprehensive Loss, Net of Taxes [Member] District Energy Business [Member] District Energy Business [Member] District Energy [Member] AOCI Attributable to Noncontrolling Interest [Member] Noncontrolling Interest [Member] Amount of base management fees incurred by the company for the period to its manager, a related party that was or will be settled in shares of the company. Base Management Fee to Manager Related Party Settled in Shares Base management fees to be settled/settled in shares Base management fees to be settled/settled in LLC interests Amount of performance fees incurred by the company for the period to its manager, a related party that was or will be settled in cash. Performance Fee To Manager Related Party Settled In Cash Performance fee settled in cash Current Fiscal Year End Date Current Fiscal Year End Date The amount of performance fees reinvested in additional shares of the company. Performance Fee Reinvested Performance fee reinvested Document Period End Date Document Period End Date C A [Member] Canada- IMTT [Member] Expenses incurred from advisory and consulting costs. Advisory Costs Incurred Advisory fees Equity Offering [Member] Equity Offering [Member] Equity Offering [Member] Idaho Wind Partners [Member]. Idaho Wind Partners [Member] Idaho Wind Partners [Member] Idaho Wind Partners 1, LLC (IWP Project) [Member] Atlantic Aviation [Member] Atlantic Aviation [Member] Atlantic Aviation [Member] Derivative Notional Amount Notional amount of derivative Notional amount of derivative Kansas City [Member] Kansas City [Member] Downtown Airport Kansas City, Missouri [Member] Equity Bridge Loan [Member] Equity Bridge Loan [Member] Equity Bridge Loan [Member] Entity [Domain] Mihi Llc [Member] MIHI LLC [Member] MIHI LLC [Member] Investment Project Estimated Life Term. Investment Project Estimated Life Term Life of Purchase Power Agreements Hawaii Gas Business [Member]. Hawaii Gas Business [Member] Hawaii Gas Business [Member] Hawaii Gas Business [Member] Leasehold Interests [Member] Leasehold Interests [Member] Leasehold rights [Member] Amount of total debt outstanding at the balance sheet date that is not hedged with a derivative instrument. Unhedged Debt Unhedged debt Macquarie Bank Limited [Member] Macquarie Bank Limited [Member] The share amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of securities. Amount Of Dilutive Securities Stock Options And Restrictive Stock Units Shares Potentially dilutive shares Restricted Stock Unit Grants May Twenty One Twenty Fouteen [Member]. Restricted Stock Unit Grants May Twenty One Twenty Fourteen [Member] Restricted stock unit grants May 21, 2014 [Member] Restricted Stock Unit Grants May Twenty Twenty Thirteen [Member] Restricted Stock Unit Grants May Twenty Twenty Thirteen [Member] Restricted stock unit grants May 20, 2013 [Member] Macquarie Energy North America Trading [Member] Macquarie Energy North America Trading [Member] MENAT [Member] Gross carrying amount, for both finite and indefinite lived intangibles excluding goodwill, before accumulated amortization as of the balance sheet date of the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a reasonably expected period of economic benefit. Finite And Indefinite Lived Trade Names Gross Trade names Dividend Thirteen [Member] Dividend Thirteen [Member] Dividend Twleve [Member] Dividend Twleve [Member] Dividend Eleven [Member] Dividend Eleven [Member] Dividend Ten [Member] Dividend Ten [Member] Dividend Nine [Member] Dividend Nine [Member] Dividend Eight [Member] Dividend Eight [Member] Dividend Seven [Member] Dividend Seven [Member] Dividend Six [Member] Dividend Six [Member] Dividend Five [Member] Dividend Five [Member] Dividend Four [Member] Dividend Four [Member] Trading Symbol Trading Symbol Dividend Three [Member] Dividend Three [Member] Dividend Two [Member] Dividend Two [Member] Dividend One [Member] Dividend One [Member] Contracted Power Generation Facilities [Member] Contracted Power Generation Facilities [Member] Cash dividend paid to the manager, a related party Cash Dividend Paid To Manager Related Party Cash Paid to Manager Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Megawatts capacity. Capacity Of Plant Capacity of Power generating units (MW) Electricity generating capacity The amount of goodwill acquired during prior business acquisitions, net of disposals. Accumulated Goodwill Acquired During Prior Business Acquisitions Net Of Disposals Goodwill acquired in business combinations, net of disposals Represents the number of shares issued to the manager, a related party, to settle the base management fees and performance fees, if any, for the period. Number Of Shares Issued To Manager For Base Management Performance Fees Shares Issued Represents the number of shares reinvested by the manager, a related party, for fees subsequent to the balance sheet date. Number Of Shares Issued To Manager For Subsequent Base Management And Performance Fees Shares issued subsequent, for fees to manager Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Valley Center [Member] Valley Center [Member] Valley Center [Member] Legal Entity [Axis] Document Type Document Type Entity Number Of Employees Number of employees Gross amount, at the balance sheet date, of long-lived, depreciable assets that represents the right to utilize private/third-party real estate space. Easements Gross Easements Variable term loan with interest rate floor on minimum LIBOR rate. Variable Term Loan Interest Rate Floor Variable term loan Interest rate floor The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation recorded in both depreciation expense and cost of services on the statement of operations. Depreciation Expense And Depreciation In Cost Of Service Depreciation Depreciation and amortization of property and equipment Depreciation The non-cash gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. Noncash Gain Loss On Disposition Of Assets Loss on disposal of assets Loss on disposal of assets Loss on disposal of assets This item represents the portion of the base management fee which was/will be reinvested in the shares of the company. Base Management Fees Settled In Shares Base management fees to be settled/settled in shares This item represents the portion of the performance fee which was/will be reinvested in the shares of the company. Performance Fees Settled In Shares Performance fees to be settled in shares The net amount of equipment lease principal payments received during the reporting period. Equipment Lease Receivable Net Equipment lease receivable, net Basis of Presentation [Abstract] The net change during the reporting period in the cumulative difference between actual rent paid and rental expense recognized on a straight-line basis. Increase Decrease In Deferred Rent Deferred rent The net change during the reporting period for amounts payable in cash to the manager, a related party, for base management fees, performance fees, if any, out of pocket expenses and any current liabilities due to manager. Increase Decrease In Due To Manager Related Party Due to manager - related party Amount of accrued expenses incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Expenses Accrued expenses The amount of equity issuance costs that were incurred during a noncash or partial noncash transaction. Equity Issuance Costs Incurred During Noncash Or Partial Noncash Transaction Accrued equity offering costs This item represents the portion of the performance fee which was reinvested in the shares of the company. Issuance Of Shares To Manager For Performance Fees Issuance of common stock to manager for performance fees This item represents the portion of fees which was reinvested in the shares of the company. Issuance Of Shares To Manager For Fees Issuance of common stock to manager Shares issued to independent directors pursuant to the directors'' compensation plan. Issuance Of Shares To Independent Directors Issuance of common stock to independent directors Represents the company's dividend reinvestment/direct stock purchase program. Macquarie Infrastructure Company Direct Program [Member] MIC Direct [Member] Accrued Expenses [Abstract] The cash outflow by reportable segment associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Capital Expenditure For Report Segment [Table Text Block] Schedule of Capital Expenditures Common Stock Equity [Line Items] Common Stock Equity [Line Items] Common Stock Equity [Line Items] Common Stock Equity [Table] Common Stock Equity [Table] Common Stock Equity [Table] Accounts Payable Current Accounts payable Debt Disclosure [Line Items] Debt Disclosure [Line Items] Debt Disclosure [Line Items] Debt Disclosure [Table] Debt Disclosure [Table] Debt Disclosure [Table] Accounts Receivable Net Current Accounts receivable, less allowance for doubtful accounts of $1,513 and $771, respectively Accounts receivable Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] EBITDA consists of earnings before interest, taxes, depreciation and amortization. Non-cash items that are excluded consist of impairments, derivative gains and losses and all other non-cash income and expense items. Earnings Before Interest Taxes Depreciation And Amortization Excluding Non Cash Items EBITDA excluding non-cash items EBITDA excluding non-cash items Total reportable segments EBITDA excluding non-cash items Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] Organization, Consolidation and Presentation of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization, Consolidation and Presentation of Financial Statements Disclosure [Table] Percentage of an entity's outstanding debt that is not designated as a hedged item in cash flow, fair value, or net investment hedge. Percentage Of Debt Hedged By Interest Rate Derivatives Non Designated Percentage of debt hedged with Interest rate swaps Tabular disclosure of the carrying amounts of property, plant and equipment, goodwill and total assets by reportable operating segment information. Property Plant Equipment Goodwill And Total Assets Reportable Segment [Table Text Block] Schedule of Assets of Reportable Segments Accounts Receivable, Related Parties, Current Accounts receivable, related party Reportable Segment One [Member] Reportable Segment One [Member] Reportable Segment [Member] Segment Information by Secondary Segment [Domain] Segment Information By Secondary Segment [Domain] Segment Information by Secondary Segment [Domain] Segment Reporting, Assets Segment Reporting Assets Total Assets Total assets of reportable segments Accretion Expense Amortization of tolling agreements Amortization of tolling agreements Segment Reporting Information, by Secondary Segment [Axis] Segment Reporting Information By Secondary Segment [Axis] Segment Reporting Information, by Secondary Segment [Axis] Senior Secured Term Loan Facility [Member] Senior Secured Term Loan Facility [Member] Senior Secured Term Loan Facility [Member] Shares Activity [Line Items] Shares Activity [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Term Loan Facility [Member] Term Loan Facility [Member] Term Loan Facility [Member] The carrying amount as of the balance sheet date of the total asset balance at the corporate level, including intersegment assets eliminated in segment reporting. Total Assets Corporate And Other Corporate and other U S [Member] United States- IMTT [Member] Total Reportable Segments [Member] Total Reportable Segments [Member] Total reportable segments [Member] Tax-exempt Bonds [Member]. Tax Exempt Bonds [Member] Tax-exempt bonds [Member] Loan From Previous Shareholder [Member]. Loan From Previous Shareholder [Member] Loan From Previous Shareholder [Member] Gulf Opportunity Zone Bonds One [Member] Gulf Opportunity Zone Bonds One [Member] LA Bonds One [Member] Gulf Opportunity Zone Bonds Two [Member] Gulf Opportunity Zone Bonds Two [Member] LA Bonds Two [Member] Gulf Opportunity Zone Bonds Three [Member] Gulf Opportunity Zone Bonds Three [Member] LA Bonds Three [Member] Gulf Opportunity Zone Bonds Four [Member] Gulf Opportunity Zone Bonds Four [Member] LA Bonds Four [Member] New Jersey Economic Development Authority Dock Facility Revenue Refund Bonds [Member] New Jersey Economic Development Authority Dock Facility Revenue Refund Bonds [Member] New Jersey Economic Development Authority Revenue Refund Bonds [Member] New Jersey Economic Development Authority Variable Rate Demand Revenue Refunding Bonds [Member] New Jersey Economic Development Authority Variable Rate Demand Revenue Refunding Bonds [Member] Amount of long-term debt due within or after one year or the normal operating cycle, if longer, assumed at the acquisition date. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities Long Term Debt Debt balance Amortizing term loan debt assumed Accrual for Taxes Other than Income Taxes, Current Real estate The term for which the variable rate has been at a fixed percentage. Debt Instrument Interest Rate Fixed Percentage Term Hedging instrument, term The percentage of the 30-day variable rate to determine the interest rate on the debt instrument. Debt Instrument Percentage Of Variable Rate Percentage of 30-day LIBOR The amount of current restricted cash recognized as of the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash Restricted cash Represents information pertaining to 2014 wind power generation facilities. Wind Power Generation Facilities 2014 [Member] 2014 wind power generation facilities [Member] Represents the amount of distributions payable to noncontrolling interests in non-cash investing and financing activities. Distributions Payable to Noncontrolling Interests Distributions payable to noncontrolling interests Distributions payable to noncontrolling interests The percentage of energy generating capacity for which acquiree has creditworthy off-taker. Percentage Of Energy Generating Capacity For Which Acquiree Has Creditworthy Off Taker Percentage of energy generating capacity for which acquiree has creditworthy off-taker Number of wind turbines. Number Of Wind Turbines Number of wind turbines Change in the interest rate fixed by derivative instruments. Change In Debt Instrument Fixed Margin Change in fixed interest rate Interest Rate Swap And Commodity Swap [Member]. Interest Rate Swap And Commodity Swap [Member] Interest Rate Swaps and Commodity Swaps [Member] Losses On Derivative Contracts [Member]. Losses On Derivative Contracts [Member] Gains (Losses) on Derivative Contracts [Member] Twenty Fourteen Independent Director Equity Plan [Member]. Twenty Fourteen Independent Director Equity Plan [Member] 2014 Independent Director Equity Plan [Member] Non Reportable Segment [Member]. Non Reportable Segment [Member] Non Reportable Segment [Member] Amount of performance fees incurred by the company for the period to its manager, a related party that was or will be settled in shares of the company and cash. Performance Fee To Manager Related Party Settled In Shares And Or Cash Performance fees to be settled/settled in shares and cash Weighted average life of tolling agreements. Weighted Average Life Of Tolling Agreements Weighted average remaining life of tolling agreements One Month Libor [Member]. One Month Libor [Member] One-month LIBOR [Member] Accrued Insurance, Current Insurance Financial information of segment from before it was acquired by the company. Prior To Acquisition [Member] Prior to acquisition [Member] Represents information pertaining to Macquarie Capital Markets Canada Ltd. Macquarie Capital Markets Canada Ltd [Member] Macquarie Capital Markets Canada Ltd [Member] Additions or improvements to real estate assets held and assets under a lease arrangement. Land and Leasehold Improvements [Member] Leasehold and Land Improvements [Member] Fixed Based Operations [Axis]. Fixed Based Operations [Axis] Fixed Based Operations [Domain]. Fixed Based Operations [Domain] Multiple Fixed Based Operations [Member]. Multiple Fixed Based Operations [Member] Multiple FBOs [Member] One Specific Fixed Based Operation [Member]. One Specific Fixed Based Operation [Member] One specific FBO [Member] Incremental Depreciation Due To Change In Policy [Member]. Incremental Depreciation Due To Change In Policy [Member] Incremental depreciation due to change in policy [Member] Incremental Amortization Due To Change In Policy [Member]. Incremental Amortization Due To Change In Policy [Member] Incremental amortization due to change in policy [Member] Restricted Stock Unit Grants June 18 Twenty Fifteen [Member]. Restricted Stock Unit Grants June Eighteen Twenty Fifteen [Member] Restricted stock unit grants June 18, 2015 [Member] Current portion of the tolling agreement, to be amortized over one year. Tolling Agreements Current Tolling agreements - current NonCurrent portion of the Tolling agreement, to be amortized after one year. Tolling Agreements Noncurrent Tolling agreements - noncurrent Total number of special stock redeemable solely at the option of the issuer issued to the Manager. Special Stock, Shares Issued Special stock, issued Expected future cash outflow to pay for business combination that have been accrued during current period. Accrued Acquisition Costs Accrued acquisition costs Accrued Liabilities Current Accrued expenses Accrued expenses Accrued interest Percentage of tolling agreement that is contracted. Percentage Of Contracted Tolling Agreement Percentage of contracted tolling agreement Bayonne Energy Center [Member] Bayonne Energy Center [Member] Current portion of the tolling agreement, to be amortized over one year. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Tolling Agreements Tolling agreements - current NonCurrent portion of the Tolling agreement, to be amortized after one year. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Tolling Agreements Tolling agreements - noncurrent The amount of intangible liabilities assumed (as defined) which have been recognized as of the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities Intangible liabilities Senior Series A Notes [Member] Senior Series A Notes [Member] Senior Series B Notes [Member] Senior Series B Notes [Member] G O Zone Bonds Five [Member] G O Zone Bonds Five [Member] LA Bonds Five [Member] Total amount of equity offering available for issue to public, at the option of the company. Maximum Amount Of Gross Offering Aggregate gross offering price Special Stock [Member] Special Stock [Member] Capacity Leased To Related Party Capacity Leased To Related Party Capacity leased to related party The number of shares sold. Number Of Shares Sold Number of shares sold Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Less: accumulated depreciation Contracted Power and Energy Businesses [Member] Contracted Power and Energy Businesses [Member] Tabular disclosure of the selected consolidated financial data in the annual financial statements. Schedule of Consolidated Financial Information [Table Text Block] Schedule of Selected Consolidated Financial Data Amount of value of special stock redeemable solely at the option of the issuer. Special Stock, Value Special stock ($0.001 par value; 100 authorized; 100 shares issued and outstanding at June 30, 2015) Face amount or stated value per share of special stock redeemable solely at the option of the issuer. Special Stock, Par Or Stated Value Per Share Special stock, par value per share The maximum number of special stock redeemable solely at the option of the issuer permitted to be issued by an entity''s charter and bylaws. Special Stock, Shares Authorized Special stock, authorized Aggregate share number for all special stock redeemable solely at the option of the issuer held by the Manager. Special Stock, Shares Outstanding Special stock, outstanding The amortization of intangible tolling agreement in a systematic and rational manner over the life of the agreement. Amortization Of Tolling Agreements Intangible Amortization of tolling agreement liabilities Amortization of tolling agreements Amortization of tolling agreement liabilities Accumulated Translation Adjustment [Member] Translation Adjustment, net of taxes [Member] The non-cash conversion from LLC interests to common stock, at par value. Conversion Of LLC Interests To Common Stock Conversion of LLC interests to common stock The non-cash conversion from LLC interests to common stock, in excess of par value. Conversion Of LLC Interests To Common Stock APIC Conversion of LLC interests to additional paid in capital Percentage of debt outstanding hedged as of the balance sheet date. Percentage Of Outstanding Debt Hedged Percentage of outstanding debt hedged At the Market [Member] At the Market [Member] Number of directors Number Of Directors Right to appoint number of directors MCUSA [Member] MCUSA [Member] MEF [Member] MEF [Member] This item represents the portion of the fees to manager which was/will be reinvested in the shares of the company. Manangement Fees Settled In Shares Fees to manager-related party Amount of derivative liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Derivative Instruments Fair value of derivative instruments - current Amount of derivative liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Derivative Instruments Fair value of derivative instruments - non-current Interest rate swap breakage fees incurred in connection with mandatory prepayment of principal debt in accordance with debt agreement. Interest Rate Swap Breakage Fees Interest rate swap breakage fees The date subject to tender for debt instruments. Debt Subject To Tender Date Tender period Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and convertible debt securities using the if-converted method. Incremental Common Shares Attributable To Share Based Payment Arrangements And Conversion Of Debt Securities Dilutive effect of restricted stock unit grants and convertible senior notes Payment on early termination of interest rate swap agreement. Payment On Early Termination Of Interest Rate Swap Agreement Payment on early termination of interest rate swap agreement Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Cash Flow Hedges, net of taxes [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Member] Total Accumulated Other Comprehensive Loss, net of taxes [Member] Accumulated Other Comprehensive Income Loss Net Of Tax Ending Balance Beginning Balance Accumulated other comprehensive loss Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Additional Paid In Capital Common Stock Additional paid in capital Additional Paid-in Capital [Member] Additional Paid in Capital [Member] Adjustments for Change in Accounting Principle [Axis] Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Advertising Costs, Policy [Policy Text Block] Advertising NJEDA Bonds [Member] Allowance For Doubtful Accounts Receivable Current Accounts receivable, allowance for doubtful accounts Amortization Of Intangible Assets Amortization of intangibles Amortization of intangible assets Amortization of intangibles Amortization of intangibles Amortization Of Financing Costs Amortization of debt financing costs Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities Asset Impairment Charges Asset impairment charges Assets [Abstract] ASSETS Assets, Fair Value Disclosure Fair value of wind turbines Assets Total assets Total assets Assets Current Total current assets Assets Current [Abstract] Current assets: Base Rate [Member] Alternate Base Rate [Member] Basis Swap [Member] LIBOR Swap [Member] Basis of Accounting [Text Block] Basis of Presentation Bonds [Member] LA Bonds [Member] Building [Member] Buildings [Member] Buildings And Improvements Gross Buildings Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Deferred income taxes Business Acquisition, Percentage of Voting Interests Acquired Equity interest acquired Interest acquired Business Combination, Consideration Transferred Purchase price Net assets paid Business acquisition, purchase price Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Other noncurrent liabilities Business Combination, Contingent Consideration, Liability Amount expected for Boca Aviation Acquisition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Current liabilities Other current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Total current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Prepaid expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Amortizing term loan debt assumed Debt assumed, excluding transaction costs Amortizing term loan debt assumed Long-term debt, net of current portion Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Cash and cash equivalents Business acquisition, cash paid Business Acquisition, Pro Forma Revenue Revenue Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Pro Forma Results Business Combination, Consideration Transferred, Liabilities Incurred Debt assumed Business Acquisition, Pro Forma Net Income (Loss) Net income attributable to MIC Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Restricted cash - current Other current assets Business Acquisition [Axis] Business Acquisition [Axis] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt Current portion of long term debt Current portion of amortizing term loan debt assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total liabilities assumed Total liabilities assumed Acquisitions [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets Other noncurrent assets Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Fair value gain on previously held interest in equity method investee recognised on business acquisition Gain from acquisition/divestiture of businesses Less: Gain on remeasuring the equity method investment to fair value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Total current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Noncurrent liabilities Business Acquisition, Goodwill, Expected Tax Deductible Amount Goodwill deductible for tax purposes Business Combination, Acquisition Related Costs Transaction related costs Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Net assets acquired Net assets acquired Business acquisition, purchase price Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property, equipment, land and leasehold improvements Property, equipment, land and leasehold improvements acquired Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Noncontrolling interest Capital Leases, Balance Sheet, Assets by Major Class, Net Book Value of equipment under capital lease Capital Leases, Future Minimum Payments, Receivable Due Thereafter Thereafter Capital Leases, Future Minimum Payments Receivable Total Capital Leases, Future Minimum Payments Due Present value of minimum payments Capital Leases, Future Minimum Payments Receivable, Next Twelve Months 2014 Capital Leases, Future Minimum Payments Due in Two Years 2016 Capital Leases, Future Minimum Payments, Receivable in Five Years 2018 Capital Leases, Future Minimum Payments Due in Five Years 2019 Capital Expenditures Incurred But Not Yet Paid Accrued purchases of property and equipment Capital Lease Obligations, Noncurrent Long-term portion Capital leases, net of current portion Capital Leases, Future Minimum Payments, Receivable in Four Years 2017 Capital Leases in Financial Statements of Lessor Disclosure [Text Block] Direct Financing Lease Transactions Capital Leases, Future Minimum Payments Due in Three Years 2017 Capital Leases, Future Minimum Payments, Receivable in Two Years 2015 Capital Leases, Future Minimum Payments Due in Four Years 2018 Capital Lease Obligations, Current Current portion of capital leases Less: current portion Capital Lease Obligations Incurred Acquisition of equipment through capital leases Capital Leases in Financial Statements of Lessee Disclosure [Text Block] Capital Leases Capital Leases, Future Minimum Payments Due, Next Twelve Months 2015 Capital Leases, Future Minimum Payments, Receivable in Three Years 2016 Capital Leases, Future Minimum Payments Due Thereafter Thereafter Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Capital Leases Capital Units, Outstanding Special stock, outstanding Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received Minimum lease payments receivable Capital Leases, Net Investment in Direct Financing Leases Net investment in direct financing leases Capital Units, Authorized Special stock, authorized Capital Leases, Net Investment in Direct Financing Leases [Abstract] Equipment lease: Capital Leases, Net Investment in Direct Financing Leases, Deferred Income Less: unearned financing lease income Capital Units, Value Special stock ($0.001 par; 100 authorized; 100 shares issued and outstanding at June 30, 2015) Direct Financing Lease Transactions [Abstract] Capitalized Computer Software, Gross Technology Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash [Member] Cash [Member] Cash And Cash Equivalents At Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash And Cash Equivalents Period Increase Decrease Net change in cash and cash equivalents Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months Net derivative losses, included in accumulated other comprehensive loss, reclassified over next 12 months Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Adjustments for Change in Accounting Principle [Domain] Class Of Stock [Line Items] Class of Stock [Line Items] Class of Stock [Domain] Commercial Paper, at Carrying Value Commercial paper Commitments And Contingencies Commitments and contingencies Legal Proceedings and Contingencies [Abstract] Commodity Contract [Member] Commodity swaps [Member] Common Stock Value Common stock ($0.001 par value; 500,000,000 authorized; 79,501,783 shares issued and outstanding at June 30, 2015); LLC interests (no par value; 71,089,590 LLC interests issued and outstanding at December 31, 2014) Label 2 Common Stock Shares Issued Shares, issued Common Stock, Dividends, Per Share, Cash Paid Dividends to shareholders, per share Common Stock Shares Authorized Shares, authorized Shares, authorized Common Stock Dividends Per Share Declared Cash dividends declared per common stock Common Stock, Par or Stated Value Per Share Common stock, par value per share Common Stock [Member] Shares [Member] Common Stock Shares Outstanding Balance (in shares) Balance (in shares) Shares, outstanding Common Stock No Par Value Shares, no par value Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive (loss) income Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Less: comprehensive (loss) income attributable to noncontrolling interests Comprehensive Income, Policy [Policy Text Block] Comprehensive Income Comprehensive Income Net Of Tax Comprehensive (loss) income attributable to MIC Computer Software, Intangible Asset [Member] Software [Member] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Credit Risk Consolidation, Policy [Policy Text Block] Principles of Consolidation Construction Loan Construction loan Construction Loan Construction In Progress Gross Construction in progress Contractual Rights [Member] Contractual Rights [Member] Contract arrangements [Member] Conversion of Stock [Line Items] Conversion of Stock, Shares Issued Shares issued per LLC interest Conversion of Stock, Amount Issued Conversion of LLC interests Conversion of Stock [Table] Convertible Debt Convertible senior notes Convertible Debt Securities [Member] Convertible Senior Notes [Member] Convertible Debt [Member] Convertible Senior Notes [Member] Corporate Segment [Member] MIC Corporate [Member] Cost Method Investment Cost Method Investment in unconsolidated business Cost Of Services Cost of services Cost Of Goods Sold Cost of product sales Cost of Sales [Member] Cost of product sales [Member] Costs And Expenses [Abstract] Costs and expenses Costs And Expenses Total operating expenses Selling, general and administrative - corporate Credit Facility [Domain] Credit Facility [Domain] Credit Facility [Axis] Credit Facility [Axis] Current Income Tax Expense (Benefit) Total current tax provision Current Federal Tax Expense (Benefit) Federal Current State and Local Tax Expense (Benefit) State Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current taxes: Customer Relationships [Member] Customer relationships [Member] Customer Deposits, Current Customer deposits Debt Instrument, Description of Variable Rate Basis Description of Variable Rate Basis Variable rate basis Debt Instrument [Line Items] Debt Instrument [Line Items] Convertible senior notes converted to equity Conversion of construction loan to term loan Amount of senior notes converted Debt [Member] Debt [Member] Debt Instrument, Term Debt instrument, term Term of debt instrument Long-Term Debt [Abstract] Debt Instrument, Convertible, Conversion Ratio Conversion rate Debt, Weighted Average Interest Rate Weighted average interest rate Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument, Basis Spread on Variable Rate Interest Rate, spread above LIBOR Fixed portion of interest rate component Debt Instrument [Axis] Debt Instrument [Axis] Debt Issuance Cost Debt issuance costs Long-term Debt, Gross Debt outstanding Debt Instrument, Convertible, Conversion Price Conversion price Debt Instrument, Maturity Date Maturity Maturity date Debt Instrument, Fee Amount Debt fee Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument, Face Amount Face value of convertible senior notes Principal amount of debt Debt Issuance Costs Incurred During Noncash Or Partial Noncash Transaction Accrued financing costs Debt Instrument, Interest Rate, Stated Percentage Interest Rate Debt Instrument, Interest Rate, Basis for Effective Rate Debt Instrument Interest Rate Debt, Policy [Policy Text Block] Debt Issuance Costs Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Tax Liabilities, Prepaid Expenses Prepaid expenses Postretirement Benefits, Type of Deferred Compensation [Axis] Postretirement Benefits, Type of Deferred Compensation [Axis] Deferred Federal Income Tax Expense (Benefit) Federal Deferred Finance Costs, Noncurrent, Net Deferred financing costs, net of accumulated amortization Deferred Income Tax Expense Benefit Deferred taxes Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred taxes: Deferred Tax Assets, Deferred Income Deferred revenue Deferred Tax Assets, Net Net deferred tax liabilities Net deferred tax liability Deferred State and Local Income Tax Expense (Benefit) State Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Accrued compensation Deferred Tax Assets Net Current Deferred income taxes Less: current deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Net deferred tax assets Deferred Tax Assets, Operating Loss Carryforwards Net operating loss carryforwards Deferred Tax Assets, Gross Total gross deferred tax assets Deferred Tax Assets, Other Other Deferred Tax Assets, Net [Abstract] Deferred tax assets: Deferred Tax Assets, Derivative Instruments Unrealized losses Deferred Tax Assets, Tax Deferred Expense, Other Allowance for doubtful accounts Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Investment basis difference Deferred Tax Liabilities, Intangible Assets Intangible assets Deferred Tax Liabilities, Net Total deferred tax liabilities Deferred Tax Assets, Valuation Allowance Valuation allowance Less: valuation allowance Deferred Tax Liabilities, Gross [Abstract] Deferred tax liabilities: Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Accrued expenses Deferred Tax Liabilities, Property, Plant and Equipment Property and equipment Deferred Tax Liabilities Noncurrent Deferred tax liability, noncurrent Deferred income taxes Noncurrent deferred tax liabilities Defined Benefit Pension Plan Liabilities, Current Current liabilities Defined Benefit Plan, Expected Future Benefit Payments, Year Five 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2018 Defined Benefit Plan, Amounts Recognized in Balance Sheet Net amount recognized in balance sheet Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract] Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss: Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2015 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2017 Defined Benefit Plan, Target Plan Asset Allocations Defined benefit plan, plan asset investment percentage Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2016 Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Discount rate Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] Other changes recognized in other comprehensive loss (income): Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract] Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year: Defined Benefit Plan, Amortization of Gains (Losses) Amortization of loss Recognized actuarial loss Defined Benefit Plan, Actuarial Gain (Loss) Actuarial losses (gains) Actuarial losses (gains) Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract] Amounts recognized in balance sheet consisting of: Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Discount rate Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Thereafter Defined Benefit Plan, Future Amortization of Gain (Loss) Amortization of net loss Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax Accumulated other comprehensive loss Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service credit Amortization of prior service credit Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Actual Return on Plan Assets Actual return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Expected long-term rate of return on plan assets during fiscal year Expected return on defined benefit plan assets, percentage Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax Accumulated loss Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax Net loss (gain) arising during the year Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Rate of compensation increase Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) Amortization of prior service cost Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Percentage of employer's contribution under the defined contribution plan Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax Total recognized in other comprehensive loss (income) Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets Fair value of plan assets - IMTT Acquisition Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Change in plan assets: Defined Benefit Plan, Benefits Paid Benefits paid Defined Benefit Plan, Funded Status of Plan [Abstract] Funded status Defined Benefit Plan, Contributions by Plan Participants Participant contributions Defined Benefit Plan, Funded Status of Plan Funded status at end of year Defined Benefit Plan, Benefit Obligation Benefit obligation - end of year Benefit obligation - beginning of year Benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Change in benefit obligation: Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation Benefit obligation - IMTT Acquisition Defined Benefit Plan, Interest Cost Interest cost Defined Benefit Plan, Fair Value of Plan Assets Fair value of plan assets - end of year Fair value of plan assets - beginning of year Fair value of plan assets Defined Benefit Plan, Contributions by Employer Employer contribution - defined benefit plan Employer/participant contributions Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] Assumed healthcare cost trend rates: Defined Benefit Plan, Net Periodic Benefit Cost Net periodic benefit cost Net periodic benefit cost Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Initial health care cost trend rate Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Components of net periodic benefit cost: Defined Benefit Plan, Expected Return on Plan Assets Expected return on plan assets Defined Contribution Plan, Cost Recognized Deferred compensation expense Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Weighted average assumptions to determine benefit obligations: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Weighted average assumptions to determine net cost: Defined Benefit Plan, Service Cost Service cost Defined Benefit Postretirement Life Insurance [Member] PMLI Benefits [Member] Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Ultimate rate Defined Benefit Pension Plan, Liabilities, Noncurrent Noncurrent liabilities Defined Benefit Plan, Assets for Plan Benefits, Noncurrent Noncurrent assets Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Actual Plan Asset Allocations DB Plan Weighted Average Asset Allocations Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate Year ultimate rate is reached Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax Prior service credit Depreciation Depletion And Amortization Depreciation and amortization Depreciation Depreciation Depreciation Derivative Assets Noncurrent Fair value of derivative instruments - non-current assets Fair value of derivative instruments Derivative [Line Items] Derivative [Line Items] Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net Gains (losses) on derivative instruments Gains (losses) on derivative instruments Derivative, Term of Contract Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Derivative Assets Current Fair value of derivative instruments - current assets Derivative [Table] Derivative [Table] Derivative, Maturity Date Derivatives, expiration date Derivatives, expiration date Derivative, Inception Date Interest rate cap effective date Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value Total derivative contracts - assets Derivative Instruments and Hedging Activities [Abstract] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value Total derivative contracts - liabilities Derivative, Remaining Maturity Interest rate swap term Derivative, Fixed Interest Rate Fixed interest rate Derivative Liabilities Current Fair value of derivative instruments - Current Fair value of derivative instruments Fair value of derivative instruments - current liabilities Derivative, Cap Interest Rate Interest rate cap Derivative Liability Fair value of derivative instruments Derivative Liabilities Noncurrent Fair value of derivative instruments - Noncurrent Fair value of derivative instruments Fair value of derivative instruments - non-current liabilities Derivative Amount Of Hedged Item Debt economically hedged with interest rate contracts Term loans hedged amount Derivative, Gain (Loss) on Derivative, Net Derivatives Not Designated as Hedging Instruments -Amount of Gain/(Loss) Recognized in Interest Expense Derivative, Number of Instruments Held Number of interest rate swap contracts Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments Gain Loss [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivatives, Policy [Policy Text Block] Derivative Instruments Developed Technology Rights [Member] Technology [Member] Director [Member] External Independent Directors [Member] Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation Decrease reflected in net income from discontinued operations Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Sale of property and equipment Dividend Payable Date To Be Paid Day Month And Year Cash dividend declared, date to be paid Payable Date Dividends Payable Amount Per Share Cash dividend declared per share $ per Share Dividends Payable [Table] Dividends Payable Date Of Record Day Month And Year Cash dividend declared, date of record Record Date Dividends Payable Nature Period Covered Dividends [Domain] Dividends [Axis] Dividends Payable [Line Items] Dividends Payable Date Declared Day Month And Year Cash dividend declared, date declared Declared Dividends, Common Stock, Cash Dividends to shareholders Due to Related Parties Commitment fees payable Earliest Tax Year [Member] Earliest [Member] Earnings Per Share, Policy [Policy Text Block] Income per Share Earnings Per Share, Basic and Diluted [Abstract] Income per share: Income per share: Earnings Per Share Reconciliation [Abstract] Numerator: Earnings Per Share [Text Block] (Loss) Income per Share Earnings Per Share, Diluted, Other Disclosures [Abstract] Reconciliation of the basic and diluted number of shares of common stock used in computing (loss) income per share: Earnings Per Share Basic Basic (loss) income per common stock attributable to MIC Net income (loss) per share - basic Earnings Per Share Diluted Diluted (loss) income per common stock attributable to MIC Net income (loss) per share - diluted (Loss) Income per Share [Abstract] Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash and cash equivalents Effective Income Tax Rate Reconciliation, Percent Tax rate used to calculate net income attributable to MIC Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Federal income tax rate Employee-related Liabilities, Current Payroll and related liabilities Environmental Exit Costs, Reasonably Possible Additional Losses, Low Estimate Estimated minimum cost of remediation Environmental Exit Costs, Reasonably Possible Additional Losses, High Estimate Estimated maximum cost of remediation Shareholders' Equity [Abstract] Equity Method Investment Ownership Percentage Percentage of ownership interest accounted under equity method of accounting Equity method ownership percentage Equity method ownership percentage Percentage of ownership in IMTT Proceeds from Equity Method Investment, Dividends or Distributions Equity distributions from investee Equity distributions from investee Equity Issuance Dates Issue Date Equity Component [Domain] Equity Component [Domain] Equity Securities [Member] Equity instruments [Member] Equity Method Investments Equity Method Investment in unconsolidated business Investment in IMTT Investment in unconsolidated business Liability Class [Axis] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value by Liability Class [Domain] Fair Value of Financial Instruments, Policy [Policy Text Block] Financial Instruments Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 1 [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 2 [Member] Significant Observable Inputs (Level 2) [Member] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Federal Income Tax Expense (Benefit), Continuing Operations Decrease in federal tax expense or benefit from continuing operations Financial Services Revenue [Abstract] Financing and Lease Income Financial Instrument [Axis] Financial Instrument [Axis] Finite Lived Intangible Assets Accumulated Amortization Less: accumulated amortization Finite-Lived Intangible Assets, Net Total Finite-Lived Intangible Assets, Amortization Expense, Year Three 2017 Finite Lived Customer Relationships Gross Customer relationships Finite Lived Noncompete Agreements Gross Non-compete agreements Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Finite Lived Contractual Rights Gross Contractual arrangements Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Gross Intangible assets, gross Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Asset, Useful Life Finite Lived Intangible assets, useful life Finite-Lived Intangible Assets, Amortization Expense, Year Four 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2016 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2015 Fixed Income Funds [Member] Fixed income securities - International [Member] Fixed Income Securities [Member] Fixed income securities - U.S. [Member] Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Translation Furniture And Fixtures Gross Furniture and fixtures Furniture and Fixtures [Member] Furniture and Fixtures [Member] Gains (Losses) on Derivative Contracts [Member] Gain Loss On Disposition Of Assets Loss on disposal of assets Gain (Loss) on Contract Termination Loss from customer contract termination Loss from customer contract termination Gain (Loss) on Disposition of Business Gain on disposal of business Gains (Losses) on Extinguishment of Debt Loss on extinguishment of debt Goodwill Balance at June 30, 2015 Balance at December 31, 2014 Goodwill Balance at December 31, 2014 Balance at March 31, 2015 Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block] Impairment of Indefinite-lived Intangibles, Excluding Goodwill Goodwill, Purchase Accounting Adjustments Less: purchase accounting adjustments related to 2014 acquisitions Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Impairment of Goodwill Goodwill, Written off Related to Sale of Business Unit Less: goodwill associated with sold business Goodwill, Acquired During Period Add: goodwill related to 2015 acquisitions Goodwill Impaired Accumulated Impairment Loss Less: accumulated impairment charges Goodwill And Intangible Assets Disclosure [Text Block] Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill, Other Changes Less: other Intangible Assets [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Impairment of Long-lived Assets, Excluding Goodwill Impairment of Intangible Assets (Excluding Goodwill) Intangible impairment charge Impairment of Long-Lived Assets Held-for-use Impairement charge Fixed assets impairment charge Income Loss From Equity Method Investments Equity in earnings and amortization charges of investee Equity in earnings of investee Equity in earnings and amortization charges of investee Income Statement Location [Axis] Income Statement Location [Axis] CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS [Abstract] Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Total consolidated net (loss) income before income taxes Net (loss) income before income taxes Income Taxes [Abstract] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Change in valuation allowance Income Tax Expense Benefit Provision for income taxes Total tax (benefit) provision Provision (benefit) for income taxes Benefit (provision) for income taxes Income Tax Authority [Domain] Income Tax Authority [Domain] Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Deferred income tax expense due to the effects of the rate increase Change in District Energy tax status Income Tax Disclosure [Text Block] Income Taxes Income Taxes Paid Taxes paid Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Income attributable to noncontrolling interest in joint ventures Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Impairment of non-deductible intangibles Income Tax, Policy [Policy Text Block] Income Taxes Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Tax provision at U.S. statutory rate Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Permanent and other differences between book and federal taxable income Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount Federal dividends received deduction on IMTT and district energy business dividends, pre-acquisition or disposal Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Income Taxes Payable Income taxes payable Increase Decrease In Accounts Payable And Accrued Liabilities Accounts payable and accrued expenses Increase Decrease In Operating Capital [Abstract] Changes in other assets and liabilities, net of acquisitions: Increase Decrease In Other Operating Capital Net Other, net Increase Decrease In Inventories Inventories Increase (Decrease) in Pension Plan Obligations Pension contribution Increase (Decrease) in Restricted Cash for Operating Activities Restricted cash Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other current assets Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Dilutive effect of convertible senior notes Incremental Common Shares Attributable To Share Based Payment Arrangements Dilutive effect of restricted stock unit grants Intangible Assets Net Excluding Goodwill Intangible assets, net Intangible assets, net Interest Expense Interest expense Interest Payable, Current Interest Interest Income Expense Net Interest expense, net Interest Paid Net Interest paid Interest Rate Swap [Member] Interest Rate Swaps [Member] Interest Rate Derivatives, at Fair Value, Net Fair value of derivative Interest on Convertible Debt, Net of Tax Interest expense attributable to convertible senior notes, net of taxes Interest Rate Cap [Member] Interest Rate Cap [Member] Interest Expense [Member] Interest Expense [Member] Interest Rate Contract [Member] Interest Rate Contracts [Member] Inventory, Policy [Policy Text Block] Inventory Inventory, Finished Goods, Gross Inventory Net, held for sale Inventory, Raw Materials and Supplies, Net of Reserves Inventory Net, materials and supplies Inventory Net Inventories Investment, Policy [Policy Text Block] Investments Investment Income, Dividend Dividend income Investment Income Interest Interest income Investment Owned, Percent of Net Assets Investment owned, percentage Investments in Power and Distribution Projects Capital Investment Value Latest Tax Year [Member] Latest [Member] London Interbank Offered Rate (LIBOR) [Member] LIBOR [Member] Lessor Leasing Arrangements, Operating Leases, Term of Contract Term of contracts for the use of storage capacity at the various terminals Letters of Credit Outstanding, Amount Letters of credit outstanding Long-term Debt, Percentage Bearing Fixed Interest, Amount Fixed rate debt Long-term Debt, Weighted Average Interest Rate Weighted average interest rate Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Land Land Lease And Rental Expense Lease expense on copiers Leasehold Improvements Gross Leasehold and land improvements Leaseholds and Leasehold Improvements [Member] Leasehold and land improvements [Member] Leases [Abstract] Leases of Lessee Disclosure [Text Block] Leases Capital Leases [Abstract] Legal Matters And Contingencies [Text Block] Legal Proceedings and Contingencies Letter of Credit [Member] Letter of Credit [Member] Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Liabilities Total liabilities Liabilities And Stockholders Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity Total liabilities and equity Line of Credit Facility [Table] Line of Credit Facility, Commitment Fee Percentage Commitment Fees Interest rate and fees, commitment fee percentage Lender Name [Axis] Lender Name [Axis] Long-term Line of Credit Line of credit, amount outstanding Line of Credit Facility, Commitment Fee Amount Commitment fee Line of Credit Facility, Maximum Borrowing Capacity Borrowing capacity Total Committed Amount Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Line Of Credit [Member] Stand-alone debt facility [Member] Line of Credit Facility, Current Borrowing Capacity Current amount drawn under credit facility Current borrowing capacity Facilities, current borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Undrawn portion of line of credit Remaining borrowing capacity Long-term Construction Loan, Current Construction loan, current Long Term Debt Long-term debt Current and long-term debt Current and long-term Debt Facilities, long-term debt Long-term Debt, Maturities, Repayments of Principal in Year Four 2018 Long-term Debt, Maturities, Repayments of Principal in Year Five 2019 Long Term Debt [Text Block] Long-Term Debt Long-term Debt, Maturities, Repayments of Principal in Year Three 2017 Long-term Debt, Maturities, Repayments of Principal after Year Five Thereafter Long Term Debt Current Current portion of long-term debt Less: current portion Long-term Debt [Member] Stand-alone debt facility [Member] Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2015 Long-term Debt, Maturities, Repayments of Principal in Year Two 2016 Long Term Debt Noncurrent Long-term debt, net of current portion Long-term portion Long-term portion Mergers Acquisitions And Dispositions Disclosures [Text Block] Acquisitions Machinery And Equipment Gross Machinery and equipment Machinery and Equipment [Member] Machinery and equipment [Member] Management [Member] Macquarie Infrastructure Management (USA) Inc. [Member] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions payable to noncontrolling interests Distributions to noncontrolling interest members Noncontrolling Interest, Ownership Percentage by Parent Condition for consolidation, minimum ownership percentage Ownership percentage Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Percentage of co-investor's interest reflected in noncontrolling interest Minority Interest Noncontrolling interests Nature Of Operations Organization and Description of Business Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Financing activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Operating activities Net Cash Provided By Used In Financing Activities Net cash provided by (used in) financing activities Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net Income (Loss) Available to Common Stockholders, Diluted Diluted net (loss) income attributable to MIC Net Cash Provided By Used In Operating Activities Continuing Operations Net cash provided by operating activities Net Income Loss Net income (loss) attributable to MIC LLC Net income Net (loss) income attributable to MIC Net (loss) income attributable to MIC Net income (loss) Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Investing activities Net Income Loss Attributable To Noncontrolling Interest Less: net (loss) income attributable to noncontrolling interests New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Standards Noncompete Agreements [Member] Non-compete agreements [Member] Nonoperating Income (Expense) [Member] Other (expense) income, net [Member] Nonoperating Income Expense [Abstract] Other income (expense) Number Of Reportable Segments Number of reportable segments Noncontrolling Interest, Decrease from Deconsolidation Sale of District Energy business Noncontrolling Interest [Member] Noncontrolling Interests [Member] Noncontrolling Interest, Increase from Business Combination Fair valuation adjustment to noncontrolling interest on acquisition Nondesignated [Member] Not Designated as Hedging Instrument [Member] Over Allotment Option [Member] Officer [Member] Manager [Member] Operating Leases, Future Minimum Payments Due, Next Twelve Months 2015 Operating Loss Carryforwards Valuation Allowance Net operating loss carry-forwards valuation allowance Operating Leases, Rent Expense, Net Operating leases rent expense Operating Leases, Future Minimum Payments, Due in Two Years 2016 Operating Income Loss Operating income (loss) Operating (loss) income Operating Leases, Future Minimum Payments, Due Thereafter Thereafter Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Line Items] Income Taxes [Line Items] Operating Leases, Future Minimum Payments Due Total Operating Leases, Future Minimum Payments, Due in Four Years 2018 Operating Leases, Future Minimum Payments, Due in Five Years 2019 Operating Loss Carryforwards, Expiration Date Net operating loss carry-forwards, expiration date Net operating loss carry-forwards, expiration date Operating Loss Carryforwards Net operating loss carry-forwards Operating Leases, Future Minimum Payments, Due in Three Years 2017 Organization and Description of Business [Abstract] Other Current Liabilities [Member] Other Current Liabilities [Member] Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Net loss in accumulated other comprehensive income reclassifications for cash flow hedges Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Change in post-retirement benefit plans Other Noncurrent Liabilities [Member] Other Long-term Liabilities [Member] Other Comprehensive Income Loss Net Of Tax Other comprehensive (loss) income Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Reclassification of realized losses of derivatives into earnings, taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Reclassification of realized losses of derivatives Reclassification of realized losses of derivatives into earnings Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Change in post-retirement benefit plans, taxes Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax Translation adjustment, taxes Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Translation adjustment Translation adjustment Other Assets Noncurrent Other Other Liabilities, Fair Value Disclosure Fair value of interest rate swaps Other Noncash Income Expense Other income (expense), net Other non-cash expense (income) Other non-cash expense Other non-cash expenses (income), net Other non-cash expense (income) Other Pension Plan [Member] Other Plan Benefits [Member] Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income (loss), net of taxes: Other Assets Current Other Other Expenses Other (expense) income, net Other income (expense), net Other (expense) income, net Other Liabilities Current Other Other Finite Lived Intangible Assets Gross Leasehold rights Other Liabilities Noncurrent Other Other Sales Revenue Net Other services Other Postretirement Benefit Plan, Defined Benefit [Member] Post-Retirement Benefit Plans, net of taxes [Member] Other Nonoperating Income Expense Other income, net Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent Change in post-retirement benefit plans, amount written off Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent Loss in accumulated other comprehensive income reclassifications for cash flow hedges from unconsolidated business Other Sundry Liabilities, Current Purchase of property and equipment Other Long-term Debt [Abstract] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Translation adjustment Other Accrued Liabilities, Current Other Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent Reclassification of realized losses of derivatives into earnings from unconsolidated business, taxes Products and Services [Domain] Products and Services [Domain] Parent [Member] Company [Member] MIC Corporate [Member] Payments For Proceeds From Other Investing Activities Other, net Payments Of Dividends Minority Interest Distributions paid to noncontrolling interests Payments To Acquire Businesses Net Of Cash Acquired Acquisitions of businesses and investments, net of cash acquired Acquisitions of businesses and investments, net of cash acquired Payments to Acquire Equipment on Lease Investment in capital leased assets Payments Of Dividends Dividends paid to common stockholders Payments to Acquire Businesses, Gross Business acquisition, cash paid Payments To Acquire Property Plant And Equipment Capital expenditures Capital expenditures paid Purchases of property and equipment Payments of Stock Issuance Costs Offering and equity raise costs paid Payments of Debt Issuance Costs Debt financing costs paid Payments for Previous Acquisition Payments for previous acquisition Pension Contributions Pension contribution Employee Benefit Plans [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans Pension Plan, Defined Benefit [Member] DB Plans Benefits [Member] Plan Name [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Plan Name [Domain] Preferred Stock, Par or Stated Value Per Share Preferred stock, par value per share Preferred Stock, Value, Issued Preferred stock ($0.001 par value; 100,000,000 authorized; no shares issued and outstanding at June 30, 2015) Preferred Stock, Shares Issued Preferred stock, issued Preferred Stock, Shares Authorized Preferred stock, authorized Preferred Stock, Shares Outstanding Preferred stock, outstanding Prepaid Expense Current Prepaid expenses Prepaid monthly payment Reclassification, Policy [Policy Text Block] Reclassifications Proceeds from Issuance of Debt Proceeds from debt Proceeds From Repayments Of Other Debt Payment of capital lease obligations Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital Return of investment in unconsolidated business Proceeds from (Repayments of) Restricted Cash, Financing Activities Change in restricted cash Proceeds from Construction Loans Payable Proceeds from construction loans Proceeds from Convertible Debt Proceeds from issuance of bonds Proceeds from convertible bonds Proceeds from the issuance of convertible senior notes Proceeds from (Repayments of) Secured Debt Proceeds from term loan facility Proceeds from (Repayments of) Lines of Credit Net proceeds on line of credit facilities Drawn on revolver credit facility Proceeds from Issuance or Sale of Equity Proceeds from equity offering Proceeds from Issuance of Other Long-term Debt Proceeds from issuance of bonds Proceeds from Notes Payable Amount from issue of notes payable Proceeds From Issuance Of Long Term Debt Proceeds from long-term debt Proceeds From Minority Shareholders Contributions from noncontrolling interest members Capital contribution by noncontrolling co-investor Contributions received from noncontrolling interests Proceeds from Divestiture of Businesses, Net of Cash Divested Proceeds from sale of business, net of cash divested Proceeds from Issuance of Common Stock Proceeds from the issuance of common stock Proceeds from Divestiture of Businesses Proceeds from sale of business Proceeds from Sale and Maturity of Other Investments Proceeds from sale of shares Proceeds from Stock Plans Proceeds from the issuance of common stock pursuant to MIC Direct Products and Services [Axis] Products and Services [Axis] Profit Loss Net (loss) income Net (loss) income Net (loss) income Property Plant And Equipment [Text Block] Schedule of Property and Equipment Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Policy [Policy Text Block] Property, Equipment, Land and Leasehold Improvements Property, Equipment, Land and Leasehold Improvements [Abstract] Property Plant And Equipment Other Property held for future use Property, Plant and Equipment, Useful Life Property Plant and Equipment, Useful life Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Property Plant And Equipment Net Property, Equipment, Land and Leasehold Improvements Property, equipment, land and leasehold improvements, net Property, equipment, land and leasehold improvements, net Property Plant And Equipment Gross Property, equipment, land and leasehold improvements, gross Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Property Plant And Equipment Disclosure [Text Block] Property, Equipment, Land and Leasehold Improvements Quarterly Financial Information [Text Block] Quarterly Data (Unaudited) Quarterly Data (Unaudited) [Abstract] Range [Domain] Range [Domain] Range [Axis] Range [Axis] Receivables, Policy [Policy Text Block] Allowance for Doubtful Accounts Reconciliation Of Operating Profit Loss From Segments To Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation Of Assets From Segment To Consolidated [Text Block] Schedule of Reconciliation of Assets of Reportable Segments Reconciliation Of Operating Profit Loss From Segments To Consolidated [Text Block] Schedule of EBITDA for Reportable Segments Related Party Transactions Disclosure [Text Block] Related Party Transactions Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Transactions By Related Party [Axis] Related Party [Axis] Related Party Transaction Expenses From Transactions With Related Party Reimbursement of out-of-pocket expenses Related Party [Domain] Related Party [Domain] Related Party Transactions [Abstract] Repayments of Other Debt Payment of make-whole payment Repayments Of Long Term Debt Payment of long-term debt Payment of long-term debt Repayments of Debt Repayments of debt Restricted Cash and Cash Equivalents Restricted cash Restricted Stock Units (RSUs) [Member] Restricted Stock Unit Grants [Member] Restricted Cash and Cash Equivalents, Current Restricted cash Restricted cash, current Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Retained Earnings [Member] Accumulated Deficit [Member] Retained Earnings Accumulated Deficit Retained earnings Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Revenue from Related Parties Revenue from related party Revenues Total Revenue Operating Revenue Revenue Total revenue Revenue from related party Revenues [Abstract] Revenue Revolving Credit Facility [Member] Revolving Credit Facility [Member] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Estimated Future Amortization Expense Sale of Stock [Domain] Sales Revenue Services Net [Abstract] Service Revenue Sales and Excise Tax Payable, Current Sales tax Sales Revenue Services Net Service revenue Service revenue Sales Revenue Goods Net [Abstract] Revenue from Product Sales Sales Revenue Goods Net Product Sales Product revenue Scenario, Forecast [Member] Future Scheduled Step-up [Member] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Assets Acquired and Liabilities Assumed Schedule Of Related Party Transactions Table [Text Block] Schedule of Base Management Fees and Performance Fees Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Net Funded Status [Table Text Block] Funded Status of Hawaii Gas's Balance Sheet Schedule of Allocation of Plan Assets [Table Text Block] Asset Allocations of Hawaii Gas's Pension Benefits Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Taxes Schedule Of Debt Table [Text Block] Schedule of Long-Term Debt Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of Intangible Assets Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Future Maturities of Long-Term Debt Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Schedule of Future Minimum Lease Payments Under Capital Leases Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Reconciliation of Income Taxes Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Expenses Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Loss Schedule Of Other Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block] Schedule of Location of Hedging Activities Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Commitments Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Reconciliation of Earnings Income (Loss) per Share Schedule of Quarterly Financial Information [Table Text Block] Schedule of Quarterly Data Schedule of Finite-Lived Intangible Assets [Table] Schedule of Share-based Compensation, Nonemployee Director Stock Award Plan, Activity [Table Text Block] Schedule of Stock Issued to Board of Directors Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Components of Net Periodic Benefit Cost and Other Changes in Other Comprehensive Income for Plans Schedule Of Weighted Average Number Of Shares Table [Text Block] Schedule of Reconciliation of Number of Shares Used in Computing (Loss) Income per Share Schedule Of Business Acquisitions By Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Expected Benefit Payments [Table Text Block] Estimated Future Benefit Payments Schedule of Dividends Payable [Table Text Block] Schedule of Dividends Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Text Block] Schedule of Revenue From External Customers Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Material Terms Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule Of Goodwill [Text Block] Schedule of Goodwill Schedule Of Property Plant And Equipment [Table] Schedule of Property, Plant and Equipment [Table] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule Of Segment Reporting Information By Segment [Text Block] Schedule of Segment Information Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Fair Value of Derivative Instruments Schedule Of Stock By Class [Table] Schedule of Stock by Class [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Goods and Nonemployee Services Transaction [Table] Schedule of Share-based Goods and Nonemployee Services Transaction [Table] Secured Debt [Member] Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Reportable Segments [Abstract] Segment [Domain] Segment [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment Reporting Disclosure [Text Block] Reportable Segments Segment Geographical [Domain] Segment, Geographical [Domain] Selling General And Administrative Expense Selling, general and administrative Senior Notes [Member] Senior secured notes [Member] Share-based Goods and Nonemployee Services Transaction [Line Items] Share-based Goods and Nonemployee Services Transaction [Line Items] Shares Issued, Price Per Share Equity offering, price per share Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies State and Local Income Tax Expense (Benefit), Continuing Operations Increase in state income tax expense or benefit from continuing operations Statement [Line Items] Statement [Line Items] CONSOLIDATED STATEMENTS OF MEMBERS' EQUITY [Abstract] CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS [Abstract] CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract] Equity Components [Axis] Equity Components [Axis] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Statement Business Segments [Axis] Business Segments [Axis] CONSOLIDATED CONDENSED BALANCE SHEETS [Abstract] Class of Stock [Axis] Statement Geographical [Axis] Geographical [Axis] Stock Issued During Period, Shares, Period Increase (Decrease) Equity offering, shares Stock Issued During Period, Value, Acquisitions Issuance of shares for acquisition of business Issuance of shares pursuant to IMTT acquisition Stock Issued During Period, Value, New Issues Issuance of shares Issuance of Shares Stock Issued During Period, Value, Conversion of Convertible Securities Convertible senior notes converted to equity Conversion of convertible senior notes to common stock Stock Issued During Period, Shares, New Issues Issuance of shares (in shares) Stock Issued During Period, Shares, Acquisitions Issuance of shares for acquisition of businesses, shares Issuance of shares pursuant to IMTT acquisition (in shares) Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Shareholders' equity: Stockholders Equity Note Disclosure [Text Block] Shareholders' Equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Balance Balance Total equity Stockholders Equity Total stockholders' equity Subsequent Event Type [Axis] Subsequent Event [Line Items] Subsequent Event [Member] Subsequent Events [Text Block] Subsequent Events Subsequent Events [Abstract] Subsequent Event Type [Domain] Subsequent Event [Table] Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interest Percentage of controlling interest in district energy business sold Percentage of interest Sale of Stock [Axis] nil Supplemental Cash Flow Elements [Abstract] Supplemental disclosures of cash flow information Tax Period [Axis] Tax Period [Domain] Trade Names [Member] Trade names [Member] Financial Instruments [Domain] Unrealized Gain Loss On Derivatives Adjustments to derivative instruments Use of Estimates, Policy [Policy Text Block] Use of Estimates Valuation Allowance, Deferred Tax Asset, Change in Amount Change in valuation allowance Change in valuation allowance Variable Rate [Axis] Variable Rate [Domain] Weighted Average Number Diluted Shares Outstanding Adjustment Dilutive effect of restricted stock unit grants and convertible senior notes Weighted Average Number Of Shares Outstanding Basic Weighted average number of shares outstanding: basic Weighted average number of common stock outstanding: basic Weighted Average Number Of Diluted Shares Outstanding Weighted average number of shares outstanding: diluted Weighted average number of shares outstanding: diluted Write off of Deferred Debt Issuance Cost Loss on extinguishment of debt Loss on extinguishment of debt