Acquisitions [Abstract] Mergers Acquisitions And Dispositions Disclosures [Text Block] Acquisitions Contracted Power Generation Facilities [Member] Brahms Project [Member] Brahms Project [Member] Business Acquisition Purchase Price Adjustment The amount by which the purchase price of the acquisition was adjusted during the period. Purchase price adjustment Business Combination, Acquisition Related Costs Business acquisition, purchase price Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Capacity Of Plant Capital Contribution To Investment Or Subsidiary The cash contributed to the investment/subsidiary by the company. Capital investment Construction loan Construction Loan Contracted Power Generation Facilities [Member] Davis Montham Air Force Base [Member] Davis Monthan Air Force Base [Member] Davis Monthan Air Force Base [Member] Ownership percentage Exergy Idaho Holdings [Member] Exergy Idaho Holdings [Member] Galaxy And Boca Aviation Acquisitions [Member] Galaxy And Boca Aviation Acquisitions [Member] Investments in Power and Distribution Projects Capital Investment Value Kansas City [Member] Downtown Airport Kansas City, Missouri [Member] Kansas City [Member] Payments for Previous Acquisition Percentage Of Income Loss Allocated To Coinvestor Percentage Of Income Loss Flipped Percentage of loss flipped The percentage of income/loss allocated to the co-investor that would be subsequently flipped. The percentage of income/loss allocated to the co-investor. Percentage of loss allocated to co-investor Proceeds From Investment Dividends Or Distributions Return Of Capital Cash dividends or other distributions received from consolidated subsidiaries that are returns of capital. Capital return from investment Capital contribution by noncontrolling co-investor Ramona [Member] Ramona [Member] Ramona [Member] Payments for previous acquisition Valley Center [Member] Valley Center [Member] Valley Center [Member] Wind Power Generation Business [Member] Wind Power Generation Business [Member] Atlantic Aviation [Member] Atlantic Aviation [Member] Megawatts capacity. Electricity generating capacity Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Transaction related costs Equity Method Investment Ownership Percentage Long Term Debt Current and long-term debt Proceeds From Minority Shareholders Schedule Of Business Acquisitions By Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Basis of Presentation [Abstract] Basis Of Accounting Basis of Presentation Deferred financing costs, net of accumulated amortization Deferred Finance Costs, Noncurrent, Net Equipment Lease Receivable Current Reflects the carrying amounts of current lease financing receivables net of unearned income and the allowance for losses on lease financings. Equipment lease receivables current Restricted cash Restricted Cash and Cash Equivalents, Current 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 Reflects the carrying amounts of non-current lease financing receivables net of unearned income and the allowance for losses on lease financings. Equipment Lease Receivable Noncurrent Equipment lease receivables non-current Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable, less allowance for doubtful accounts of $961 and $953, respectively Accrued Liabilities Current Accrued expenses Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Additional Paid In Capital Common Stock Additional paid in capital Assets Total assets Assets [Abstract] ASSETS Assets Current Total current assets Assets Current [Abstract] Current assets: Cash And Cash Equivalents At Carrying Value Cash and cash equivalents Commitments And Contingencies Commitments and contingencies Common Stock Value LLC interests, or shares, no par value; 500,000,000 authorized; 56,636,240 shares issued and outstanding at June 30, 2014 and 56,295,595 shares issued and outstanding at December 31, 2013 Deferred Tax Assets Net Current Deferred income taxes Deferred Tax Liabilities Noncurrent Deferred income taxes Derivative Liabilities Current Fair value of derivative instruments Equity Method Investments Investment in unconsolidated business Intangible Assets Net Excluding Goodwill Intangible assets, net Inventory Net Inventories Liabilities Total liabilities Liabilities And Stockholders Equity Total liabilities and equity Liabilities And Stockholders Equity [Abstract] LIABILITIES AND MEMBERS' EQUITY Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Long Term Debt Current Current portion of long-term debt Long Term Debt Noncurrent Long-term debt, net of current portion Minority Interest Noncontrolling interests Other Assets Current Other Other Assets Noncurrent Other Other Liabilities Current Other Other Liabilities Noncurrent Other Prepaid Expense Current Prepaid expenses Property Plant And Equipment Net Property, equipment, land and leasehold improvements, net Retained Earnings Accumulated Deficit Accumulated deficit CONSOLIDATED CONDENSED BALANCE SHEETS [Abstract] Stockholders Equity Total members' equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Members' equity: Allowance For Doubtful Accounts Receivable Current Accounts receivable, allowance for doubtful accounts Common Stock No Par Value LLC interests, no par value Common Stock Shares Authorized LLC interests, authorized Common Stock Shares Issued LLC interests, issued Common Stock Shares Outstanding LLC interests, outstanding Accrued Purchase Price Adjustment Accrued purchase price adjustment Accrued Purchase Price Adjustment Conversion of construction loan to term loan Debt Conversion, Original Debt, Amount Equity distributions from investee Proceeds from Equity Method Investment, Dividends or Distributions Loss from customer contract termination Gain (Loss) on Contract Termination Restricted cash Increase (Decrease) in Restricted Cash for Operating Activities Issuance Of LLCInterests To Independent Directors Issuance of shares to independent directors LLC interests issued to independent directors pursuant to the directors' compensation plan. Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions payable to noncontrolling interests Payments of Debt Issuance Costs Debt financing costs paid Payments of Stock Issuance Costs Offering and equity raise costs paid Acquisitions of businesses and investments, net of cash acquired Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital Proceeds from Issuance of Common Stock Proceeds from the issuance of shares Change in restricted cash Proceeds from (Repayments of) Restricted Cash, Financing Activities Proceeds from Stock Plans Proceeds from the issuance of shares pursuant to MIC Direct Net income Write off of Deferred Debt Issuance Cost Loss on extinguishment of debt This item represents the portion of the base management fee which was/will be reinvested in the LLC interests of the company by the manager. Base Management Fees Settled In L L C Interests Base management fees to be settled/settled in shares 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 and amortization of property and equipment The net amount of equipment lease principal payments received during the reporting period. Equipment Lease Receivable Net Equipment lease receivable, net 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 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 This item represents the portion of the base management fee which was reinvested in the LLC interests of the company by the manager. Issuance Of L L C Interests To Manager For Base Management Fees Issuance of shares to manager for base management fees This item represents the portion of the performance fee which was reinvested in the LLC interests of the company by the manager. Issuance Of Llc Interests To Manager For Performance Fees Issuance of shares to manager for performance fees 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 This item represents the portion of the performance fee which was/will be reinvested in the LLC interests of the company by the manager. Performance Fees Settled In Llc Interests Performance fees to be settled/settled in shares Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Amortization Of Financing Costs Amortization of debt financing costs Amortization Of Intangible Assets Amortization of intangible assets Capital Expenditures Incurred But Not Yet Paid Accrued purchases of property and equipment Capital Lease Obligations Incurred Acquisition of equipment through capital leases Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash And Cash Equivalents Period Increase Decrease Net change in cash and cash equivalents Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Debt Issuance Costs Incurred During Noncash Or Partial Noncash Transaction Accrued financing costs Deferred Income Tax Expense Benefit Deferred taxes Income Loss From Equity Method Investments Equity in earnings and amortization charges of investee Income Taxes Paid Taxes paid Increase Decrease In Accounts Payable And Accrued Liabilities Accounts payable and accrued expenses Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Income Taxes Payable Income taxes payable Increase Decrease In Inventories Inventories Increase Decrease In Operating Capital [Abstract] Changes in other assets and liabilities: Increase Decrease In Other Operating Capital Net Other, net Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other current assets Interest Paid Net Interest paid Net Cash Provided By Used In Financing Activities Net cash used in financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Financing activities Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Investing activities Net Cash Provided By Used In Operating Activities Continuing Operations Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Operating activities Other Noncash Income Expense Other non-cash income, net Payments For Proceeds From Other Investing Activities Other, net Payments Of Dividends Dividends paid to shareholders Payments Of Dividends Minority Interest Distributions paid to noncontrolling interests Payments To Acquire Businesses Net Of Cash Acquired Payments To Acquire Property Plant And Equipment Purchases of property and equipment Return of investment in unconsolidated business Proceeds From Issuance Of Long Term Debt Proceeds from long-term debt Contributions received from noncontrolling interests Proceeds From Repayments Of Other Debt Payment of notes and capital lease obligations Profit Loss Repayments Of Long Term Debt Payment of long-term debt CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS [Abstract] Supplemental Cash Flow Elements [Abstract] Supplemental disclosures of cash flow information Unrealized Gain Loss On Derivatives Adjustments to derivative instruments Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Reclassifcation of realized losses of derivatives into earnings Comprehensive Income Net Of Tax Comprehensive income (loss) attributable to MIC LLC Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Less: comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive income (loss) Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Translation adjustment Other Comprehensive Income Loss Net Of Tax Other comprehensive income Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income, net of taxes: Net income (loss) CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME [Abstract] 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 Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent Reclassification of realized losses of derivatives into earnings from unconsolidated business, taxes 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), Reclassification Adjustment from AOCI on Derivatives, Tax Reclassification of realized losses of derivatives into earnings, taxes Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax Translation adjustment, taxes Gains (Losses) on Extinguishment of Debt Loss on extinguishment of debt Costs of synthetic fuel produced from petroleum, natural gas, and/or biofuel feedstock, and direct transmission and distribution costs. Cost Of Goods Sold Utility Cost of product sales - utility 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 Total amount of the interest portion on equipment lease earned during the period. Financing Equipment Lease Income Net Financing and equipment lease income Revenue derived from the regulated (by a federal, state, or local government or agency) transmission and distribution of gas. Sales Revenue Utility Net Revenue from product sales - utility Amortization of intangibles Common Stock Dividends Per Share Declared Cash dividends declared per share Cost Of Goods Sold Cost of product sales Cost Of Services Cost of services Costs And Expenses Total operating expenses Costs And Expenses [Abstract] Costs and expenses Depreciation Depreciation Earnings Per Share Basic Basic income (loss) per share attributable to MIC LLC Earnings Per Share Diluted Diluted income (loss) per share attributable to MIC LLC Gain Loss On Disposition Of Assets Loss on disposal of assets Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Net income (loss) before income taxes Equity in earnings and amortization charges of investee CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS [Abstract] Income Tax Expense Benefit (Provision) benefit for income taxes Interest Expense Interest expense Investment Income Interest Interest income Net Income Loss Net income (loss) attributable to MIC LLC Net Income Loss Attributable To Noncontrolling Interest Less: net income (loss) attributable to noncontrolling interests Nonoperating Income Expense [Abstract] Other income (expense) Operating Income Loss Operating income (loss) Other Nonoperating Income Expense Other income (expense), net Net income (loss) Revenues Total revenue Revenues [Abstract] Revenue Sales Revenue Goods Net Revenue from product sales Sales Revenue Services Net Service revenue Selling General And Administrative Expense Selling, general and administrative Weighted Average Number Of Diluted Shares Outstanding Weighted average number of shares outstanding: diluted Weighted Average Number Of Shares Outstanding Basic Weighted average number of shares outstanding: basic Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net Interest expense, losses on derivative instruments Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Derivative Instruments and Hedging Activities [Abstract] Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Notional value Fixed portion of interest rate component Debt Instrument, Basis Spread on Variable Rate Debt, Weighted Average Interest Rate Weighted average interest rate Derivative, Fixed Interest Rate Derivative, Notional Amount Incremental Term Loan [Member] Incremental Term Loan [Member] Incremental Term Loan [Member] Parent [Member] Parent [Member] Percentage Of Outstanding Debt Hedged Percentage of outstanding debt hedged Percentage of debt outstanding hedged as of the balance sheet date. Revolving Credit Facility [Member] Term Loan Interest Rate Floor Term loan with interest rate floor on minimum LIBOR rate. Term loan interest rate floor Total Term Debt [Member] Total Term Debt [Member] Total Term Debt [Member] Atlantic Aviation [Member] Amount of total debt outstanding at the balance sheet date that is not hedged with a derivative instrument. Unhedged Debt Unhedged debt 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 Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Derivative Amount Of Hedged Item Debt economically hedged with interest rate contracts Derivative Contract Type [Domain] Derivative Contract Type [Domain] Fixed interest rate Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative [Line Items] Derivative [Line Items] Derivative [Table] Derivative [Table] Interest Rate Contract [Member] Interest Rate Contracts [Member] Interest Rate Swap [Member] Interest Rate Swaps [Member] Line Of Credit Facility Maximum Borrowing Capacity Borrowing capacity Revolving Credit Facility [Member] Segment [Domain] Segment [Domain] Statement Business Segments [Axis] Business Segments [Axis] Derivative Assets Current Fair value of derivative instruments - current assets Derivative Assets Noncurrent Fair value of derivative instruments - non-current assets Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value Total interest rate derivative contracts - assets Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value Total interest rate derivative contracts - liabilities Fair value of derivative instruments - current liabilities Derivative Liabilities Noncurrent Fair value of derivative instruments - non-current liabilities Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] 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] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Interest Rate Cap [Member] Interest Rate Cap [Member] Nondesignated [Member] Not Designated as Hedging Instrument [Member] Derivatives Not Designated as Hedging Instruments -Amount of Gain/(Loss) Recognized in Interest Expense Derivative, Gain (Loss) on Derivative, Net 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] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] Schedule Of Derivative Liabilities At Fair Value Table [Text Block] Schedule of Fair Value of Derivative Instruments 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 Intangible Assets [Abstract] Goodwill And Intangible Assets Disclosure [Text Block] Intangible Assets Balance at June 30, 2014 Goodwill, Acquired During Period Add: goodwill acquired in 2014 acquisition 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, at December 31, 2013 Goodwill Impaired Accumulated Impairment Loss Less: accumulated impairment charges Technology Capitalized Computer Software, Gross 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 Finite Lived Contractual Rights Gross Contractual arrangements Finite Lived Customer Relationships Gross Customer relationships Finite Lived Intangible Assets Accumulated Amortization Less: accumulated amortization Finite Lived Intangible Assets Gross Intangible assets, gross Finite Lived Noncompete Agreements Gross Non-compete agreements Intangible assets, net Other Finite Lived Intangible Assets Gross Leasehold rights Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of Intangible Assets Schedule Of Goodwill [Text Block] Schedule of Goodwill Income per Share [Abstract] Earnings Per Share [Text Block] Income per Share Restricted Stock Unit Grants May Twenty One Twenty Fourteen [Member] Restricted stock unit grants May 21, 2014 [Member] Restricted Stock Unit Grants May Twenty One Twenty Fourteen [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] 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 February Twenty One Twenty Thirteen [Member] Restricted Stock Unit Grants February Twenty One Twenty Thirteen [Member] Restricted stock unit grants February 21, 2013 [Member] Restricted Stock Unit Grants May Thirty One Twenty Twelve [Member] Restricted Stock Unit Grants May Thirty One Twenty Twelve [Member] Restricted stock unit grants May 31, 2012 [Member] Award Type [Axis] Award Type [Axis] Class Of Stock [Line Items] Class of Stock [Line Items] Schedule Of Stock By Class [Table] Schedule of Stock by Class [Table] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Award Type [Domain] Incremental Common Shares Attributable To Share Based Payment Arrangements Dilutive effect of restricted stock unit grants Weighted average number of shares outstanding: diluted Schedule Of Weighted Average Number Of Shares Table [Text Block] Schedule of Reconciliation of Income per Share Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Operating Loss Carryforwards Net operating loss carry-forwards Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized tax benefits used to settle audit District Energy Business [Member] District Energy Business [Member] District Energy [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] International Matex Tank Terminals [Member] International Matex Tank Terminals [Member] International Matex Tank Terminals [Member] Number of Operating Businesses Number Of Operating Businesses Number of company businesses owned in less than 80% Percentage of ownership in IMTT Maximum [Member] Maximum [Member] Operating Loss Carryforwards Valuation Allowance Net operating loss carry-forwards valuation allowance Range [Axis] Range [Axis] Range [Domain] Range [Domain] Subsidiary Of Limited Liability Company Or Limited Partnership Ownership Interest Percentage of ownership in District Energy Unrecognized Tax Benefits Unrecognized tax benefits resulting from current and prior period tax positions Valuation Allowance Deferred Tax Asset Change In Amount Change in valuation allowance Long-Term Debt [Abstract] Long Term Debt [Text Block] Long-Term Debt Contracted Power And Energy [Member] Convertible Debt Convertible senior notes Convertible Debt [Member] Convertible Debt [Member] Debt Instrument Interest Rate Fixed Percentage Term The term for which the variable rate has been at a fixed percentage. Hedging instrument, term Interest rate Debt Instrument, Interest Rate, Stated Percentage Maturity Debt Instrument, Maturity Date Debt instrument, term Debt Instrument, Term Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Secured Debt [Member] Solar Power Generation Business [Member] Solar Power Generation Business [Member] Contracted Power And Energy [Member] Contracted Power and Energy [Member] Debt Instrument [Line Items] Debt Instrument [Table] Line Of Credit [Member] Stand-alone debt facility [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Payment of long-term debt Gas Production and Distribution Business [Member] Gas Production And Distribution Business [Member] Hawaii Gas [Member] Debt Instrument [Line Items] Schedule of Long-term Debt Instruments [Table] Less: current portion Long-term portion Schedule Of Debt Table [Text Block] Schedule of Long-Term Debt Legal Proceedings and Contingencies [Abstract] Legal Matters And Contingencies [Text Block] Legal Proceedings and Contingencies Members' Equity [Abstract] Stockholders Equity Note Disclosure [Text Block] Members' Equity Common Stock Shares Dividend Reinvestment Plan Authorized The maximum number of common shares permitted to be issued by an entity's charter and bylaws under Dividend Reinvestment Plan. LLC interest , authorized under Dividend Reinvestment Plan Common Stock Shares Dividend Reinvestment Plan Unissued The number of common shares that remain unissued by an entity's charter and bylaws under Dividend Reinvestment Plan. LLC interest , unissued under Dividend Reinvestment Plan Management [Member] Manager [Member] Over-Allotment Option [Member] Parent [Member] Proceeds from Issuance or Sale of Equity Proceeds from equity offering Scenario, Unspecified [Domain] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Shares Activity [Line Items] Shares Activity [Line Items] Scenario [Axis] Stock Issued During Period, Shares, Period Increase (Decrease) Equity offering, shares Common Stock, Votes per share Common Stock Votes Per Share Number of votes for each outstanding LLC interest of the Company Related Party [Domain] Related Party Transactions By Related Party [Axis] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interest [Member] Noncontrolling Interests [Member] Reclassification of realized losses of derivatives into earnings Other Postretirement Benefit Plan, Defined Benefit [Member] Total Members Accumulated Other Comprehensive Loss Net Of Taxes [Member] Total Members Accumulated Other Comprehensive Loss Net Of Taxes [Member] Accumulated Other Comprehensive Income Loss [Axis] Accumulated Other Comprehensive Income Loss [Axis] Accumulated Other Comprehensive Income Loss [Domain] Accumulated Other Comprehensive Income Loss [Domain] Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Cash Flow Hedges, net of taxes [Member] Ending Balance Beginning Balance Total Accumulated Other Comprehensive Loss, net of taxes [Member] Accumulated Translation Adjustment [Member] Translation Adjustment, net of taxes [Member] Post-Retirement Benefit Plans, net of taxes [Member] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Loss Nature Of Operations Organization and Description of Business Organization and Description of Business [Abstract] C A [Member] Canada- IMTT [Member] U S [Member] United States- IMTT [Member] Business Acquisition, Percentage of Voting Interests Acquired Equity interest acquired Number Of Marine Terminals Number Of Solar Projects Number Of Wind Power Generation Facilities Number of wind power generation facilities Number of wind power generation facilities. Number of Airports Number Of Airports Number of Airport Locations Number of marine terminals Number of marine terminals Number of solar projects. Number of solar projects 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 interests in bulk liquid terminals business Segment Geographical [Domain] Segment, Geographical [Domain] Statement Geographical [Axis] Geographical [Axis] Percentage of controlling interest in district energy business Property, Equipment, Land and Leasehold Improvements [Abstract] Property Plant And Equipment Disclosure [Text Block] Property, Equipment, Land and Leasehold Improvements Property, equipment, land and leasehold improvements acquired Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Schedule Of Property Plant And Equipment [Table] Schedule of Property, Plant and Equipment [Table] 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 Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Less: accumulated depreciation Buildings And Improvements Gross Buildings Construction In Progress Gross Construction in progress Furniture And Fixtures Gross Furniture and fixtures Land Land Leasehold Improvements Gross Leasehold and land improvements Machinery And Equipment Gross Machinery and equipment Property Plant And Equipment Gross Property, equipment, land and leasehold improvements, gross Property, equipment, land and leasehold improvements, net Property Plant And Equipment Other Property held for future use Property Plant And Equipment [Text Block] Schedule of Property and Equipment Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Entity Number Of Employees Number of employees Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Issuance Cost Debt issuance costs Equity Bridge Loan [Member] Equity Bridge Loan [Member] Equity Offering [Member] Line of Credit Facility, Commitment Fee Amount Commitment fee Macquarie Bank Limited [Member] Macquarie Bank Limited [Member] Mihi Llc [Member] Mihi Llc [Member] MIHI LLC [Member] Performance Fee To Manager Related Party Settled In Llc Interest Equity Offering [Member] Scenario, Unspecified [Domain] Scenario [Axis] Expenses incurred from advisory and consulting costs. Advisory Costs Incurred Advisory fees 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 LLC interest of the company. Base Management Fee To Manager Related Party Settled In Llc Interest Base management fees to be settled/settled in LLC interests Hawaii Gas Business [Member] Hawaii Gas Business [Member] Hawaii Gas Business [Member] Macquarie Infrastructure Management Incorporated [Member] Macquarie Infrastructure Management Incorporated [Member] Macquarie Infrastructure Management (USA) Inc. [Member] The number of LLC interests of the company held by the manager, a related party, for the period. Number Of Llc Interests Held By Manager Related Party LLC Interests of the Company held by Manager, a related party Amount of performance fees incurred by the company for the period to its manager, a related party, that was or will be settled in LLC interest of the company. Performance fees to be settled/settled in LLC interests Lease And Rental Expense Lease expense on copiers Prepaid monthly payment Related Party [Domain] Related Party Transaction Expenses From Transactions With Related Party Reimbursement of out-of-pocket expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party [Axis] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Base management fees to be settled/settled in LLC interests Common Stock Equity [Table] Number Of Llc Interests Issued To Manager For Base Management Performance Fees LLC Interests Issued, subsequent base management and performance fees Represents the number of LLC interests reinvested by the manager, a related party, for base management and performance fees subsequent to the balance sheet date. Number Of Llc Interests Issued To Manager For Subsequent Base Management And Performance Fees Performance fee to be settled/settled in LLC interests Common Stock Equity [Line Items] Common Stock Equity [Line Items] Common Stock Equity [Line Items] Common Stock Equity [Table] Common Stock Equity [Table] Represents the number of LLC interests issued to the manager, a related party, to settle the base management fees and performance fees, if any, for the period. LLC Interests Issued Cash Dividend Paid To Manager Related Party Amount Paid to Manager Cash dividend paid to the manager, a related party. Dividend Five [Member] Dividend Five [Member] Dividend Four [Member] Dividend Four [Member] Dividend One [Member] Dividend One [Member] Payable Date Dividends [Axis] Dividends [Domain] Dividend Six [Member] Dividend Six [Member] $ per LLC Interest Declared Record Date Dividends Payable [Line Items] Period Covered Dividends Payable [Table] Dividend Three [Member] Dividend Three [Member] Dividend Two [Member] Dividend Two [Member] Dividend Payable Date To Be Paid Day Month And Year Dividends Payable Amount Per Share Dividends Payable Date Declared Day Month And Year Dividends Payable Date Of Record Day Month And Year Dividends Payable Nature Schedule of Dividends Payable [Table Text Block] Schedule of Dividends Schedule Of Related Party Transactions Table [Text Block] Schedule of Base Management Fees and Performance Fees Reportable Segments [Abstract] Segment Reporting Disclosure [Text Block] Reportable Segments Exergy Idaho Holdings [Member] Investment Project Estimated Life Term Minimum [Member] Electricity generating capacity Investment Project Estimated Life Term Life of Power Purchase Agreements Number Of Reportable Segments Number of reportable segments Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Segment Reporting, Assets Segment Reporting Assets Total Assets Total Reportable Segments [Member] Total Reportable Segments [Member] Total reportable segments [Member] Property, Equipment, Land and Leasehold Improvements Capital expenditures Provision (benefit) for income taxes Net income (loss) Depreciation 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 Interest Income Expense Net Interest expense, net Other non-cash expense (income) Other Revenue Other Revenue Interest portion on equipment lease earned during the period. Finance Equipment Lease Financing and equipment lease income Total financing and equipment lease income Product sales - utility Total revenue from product sales during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Total Revenue From Product Sales Net Total Revenue from Product Sales Financial Services Revenue [Abstract] Other Revenue Other Sales Revenue Net Total Revenue Product Sales Sales Revenue Goods Net [Abstract] Revenue from Product Sales Total Other Revenues Sales Revenue Services Net [Abstract] Total assets of reportable segments 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 Investment in IMTT Loss from customer contract termination Loss on disposal of assets Other income (expense), net Loss on extinguishment of debt Depreciation Total reportable segments EBITDA excluding non-cash items Fees to manager Segment Information by Secondary Segment [Domain] Segment Information By Secondary Segment [Domain] Segment Information by Secondary Segment [Domain] Segment Reporting Information, by Secondary Segment [Axis] Segment Reporting Information By Secondary Segment [Axis] Segment Reporting Information, by Secondary Segment [Axis] Amortization of intangibles Selling, general and administrative - corporate Total consolidated net income (loss) before income taxes Other Expenses Reconciliation Of Operating Profit Loss From Segments To Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] 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] Casualty Gain Loss Net Write off of assets that are not covered by insurance resulting in a net gain or loss. Casualty losses, net EBITDA excluding non-cash items Total assets balance Depreciation Depletion And Amortization Depreciation and amortization Provision for income taxes Net income Other non-cash expenses Capital expenditures paid Revenue Reportable Segment One [Member] Reportable Segment One [Member] Reportable Segment [Member] 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 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 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 Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Text Block] Schedule of Revenue From External Customers Schedule Of Segment Reporting Information By Segment [Text Block] Schedule of Segment Information Statement [Line Items] Statement [Line Items] Statement [Table] Statement [Table] Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Value of shares issued Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Fair value gain from equity method accounting to consolidation Electricity generating capacity Debt Instrument, Convertible, Conversion Price Conversion price Debt Instrument, Convertible, Conversion Ratio Conversion rate Investment Owned, Percent of Net Assets Investment owned, percentage Proceeds from Convertible Debt Proceeds from convertible bonds Stock Issued During Period, Shares, Acquisitions Shares issued for acquisition Subsequent Event [Member] Total distribution amount declared from equity method investment to all of its shareholders for the period. Total Distribution Declared To All Shareholders From Equity Method Investment Total distribution amount declared to all shareholders from equity method investment Total distribution amount declared from equity method investment to each investor for the period. Total Distribution Declared To Each Investor From Equity Method Investment Total distribution amount declared to each investor from equity method investment Cash dividend declared, date to be paid Cash dividend declared per LLC interest Cash dividend declared, date declared Cash dividend declared, date of record Cash payment for acquisition Subsequent Event [Line Items] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Assets Acquired and Liabilities Assumed Brahms Project [Member] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Total current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Restricted cash - current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Current liabilities 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, Inventory Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total liabilities assumed Net assets acquired, net of cash acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets Other noncurrent assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Noncurrent liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Restricted cash - non-current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property, equipment, land and leasehold improvements Contractual Rights [Member] Customer Relationships [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Asset, Useful Life Galaxy And Boca Aviation Acquisitions [Member] Noncompete Agreements [Member] Trade Names [Member] Contractual arrangements [Member] Customer relationships [Member] Finite Lived Intangible assets, useful life Goodwill Goodwill Non-compete agreements [Member] Trade names [Member] Finite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived Intangible Assets [Table] Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Pro Forma Results Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Revenue Revenues Net Income Attributable to MIC LLC