Ownership Share of Equity Method Investees' Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss), Equity Method Investments [Member] Changes to accumulated comprehensive income (loss) for the entity's proportionate share of the other comprehensive income (loss) of its equity method investee after the date of acquisition. Ownership share of equity method investees' other comprehensive income Accumulated other Comprehensive Income (Loss) Net of Tax Attributable to Noncontrolling Interest Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end attributable to noncontrolling interests. Accumulated Other Comprehensive Income (Loss), Net, Attributable to Noncontrolling Interests, balance as of beginning of year Accumulated Other Comprehensive Income (Loss), Net, Attributable to Noncontrolling Interests, balance as of end of year Changes in accumulated other comprehensive income ("AOCI") balances by component Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] Total other assets Noncurrent assets other than Property, Plant, and Equipment. Assets Other than Property, Plant, and Equipment, Noncurrent Assets Other than Property, Plant and Equipment Noncurrent [Abstract] OTHER ASSETS Building and leasehold improvements Building Improvements and Lease Hold Improvement [Member] Represents information in the aggregate pertaining to addition, improvement, or renovation to a facility held for productive use and additions or improvements to assets held under a lease arrangement. Capital Beltway Express LLC [Member] Represents Capital Beltway Express LLC, a joint venture. Fluor-Transurban Capital stock Capital Stock [Abstract] Central and South America Central and South America [Member] Represents information in the aggregate pertaining to the region of Central America and the continent of South America. Change of Control Triggering Event [Member] Represents information pertaining to a change of control triggering event, as defined in the debt agreement. Change of control triggering event Closeout and Final Disposition of Other United States Government Matters [Member] Closeout and final disposition of other U.S. government matters Represents information pertaining to the closeout and final disposition of other United States government matters. Committed and Uncommitted Lines of Credit [Member] Committed and uncommitted lines of credit Represents information in the aggregate pertaining to committed and uncommitted lines of credit. Commodity contracts and foreign currency contracts Commodity Contract and Foreign Exchange Contract [Member] Represents information in the aggregate for derivative instruments whose primary underlying risks are tied to commodity prices and foreign exchange rates. Commodity Swap and Foreign Exchange Forward [Member] Represents information in the aggregate for a swap in which exchanged cash flows are dependent on the price of an underlying commodity and options or future contracts to buy or sell a certain currency, at a specified date, at a fixed exercise exchange rate. Commodity swaps and foreign currency forwards Common and Preferred Stock [Member] Represents information in the aggregate pertaining to common and preferred stock. Common and preferred stock Common Collective Trusts [Member] Represents pools of investments used by institutional investors to obtain equity and fixed income market exposures by investing in funds which are intended to mirror indices such as the Standard & Poor's 500 Index, Russell Small Cap Completeness Index, MSCI EAFE Index, MSCI Emerging Markets Index, and an actively managed long duration fixed income fund. Common or collective trusts Concession Agreement, Period Concession agreement This element represents the number of years taken to develop, design, finance, construct, maintain and operate improvements under the concession agreement. Conex International Versus Fluor Enterprises Incorporated [Member] The legal proceedings of Conex International versus Fluor Enterprises, Inc. Conex International v. Fluor Enterprises, Inc. Advances payments on account of contract work in progress Represents the amount of progress payments offset against unbilled contract receivables. Contract Receivable Progress Payments Offset Convertible Debt and Notes Payable [Member] Represents information pertaining to convertible debt and notes payable. Convertible debt and notes payable Co Owner Ownership Percentage Co-investor's interest in joint venture (as a percent) The percentage of ownership in the investee by an entity other than the reporting entity. Costs and Expenses, Operating and Nonoperating Cost of goods sold, operating expenses, non-operating income and nonoperating expenses. Total cost and expenses Date of Joining Board of Directors [Member] Upon joining Board of Directors Represents the grant date upon joining the entity's Board of Directors. Debt Instrument, Covenant Consolidated Debt to Tangible, Net Worth Ratio Ratio of consolidated debt to tangible net worth Represents the ratio of consolidated debt to tangible net worth allowed under the financial covenants of the credit facility. Debt securities maturity period Period of time to maturity of debt security which is intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Debt Security Noncurrent Term Deferred Compensation Trust Funding Funding of deferred compensation trust This element represents the funding of the deferred compensation trust. Deferred Tax Assets Tax Deferred Expense Compensation and Benefits Employee Compensation and Benefits Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation and employee benefit costs not otherwise specified in the taxonomy. Employee compensation and benefits The effect on the defined benefit plan obligation of a 25 basis-point decrease in the interest rate. Defined Benefit Plan Effect of 25 Basis Point Decrease in Assumptions Used Calculating Benefit Obligation Discount Rate Increase in plan liability, if discount rate were reduced by 25 basis points Defined Benefit Plan Fair Value of Plan Assets, Other Changes Other Changes in the fair value of defined benefit plan assets, not otherwise separately disclosed in the financial statements. Redemption notice period to redeem investments Represents redemption notice period to redeem investments in common or collective trusts, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Defined Benefit Plan Period of Notice for Redemption of Investments DTC Denver Transit Constructors [Member] Represents the Denver Transit Constructors joint venture. Denver Transit Holdings LLC [Member] Represents Denver Transit Holdings LLC , a joint venture. DTH joint venture DTP Denver Transit Partners [Member] Represents Denver Transit Partners. Denver Transit Systems and Denver Transit Constructors [Member] Represents information in the aggregate for the Denver Transit Systems and Denver Transit Constructors joint ventures. DTS and DTC Denver Transit Systems [Member] Represents the Denver Transit Systems joint venture. DTS Represents direct investments in common stock or debt securities issued by the reporting entity. Direct Investment in Company Common Stock and Debt Securities [Member] Direct investment in company common stock or debt securities Document and Entity Information Securities which are issuances by corporations within the country of domicile of the entity. Domestic Securities [Member] U.S. securities Eagle P3 Commuter Rail Project [Member] Eagle P3 Commuter Rail Project Represents information pertaining to the Eagle P3 Commuter Rail Project in the Denver metropolitan area. Effective Income Tax Rate, Discontinued Operations Effective tax rate, discontinued operations (as a percent) Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to discontinued operations. Fourth quarter pre-tax income (charges) per diluted share (in dollars per share) The income (loss) per diluted share of the item included in the fourth quarter that affected period-to-period comparability (excluding restatement adjustments), or the extraordinary item or unusual or infrequent item recognized in the fourth quarter in the absence of either a fourth-quarter report or disclosure in the annual report for the fourth quarter. Effect of Fourth Quarter Events Income (Loss) Per Diluted Share Embassy Projects Dispute Embassy Projects Dispute [Member] Represents the dispute pertaining to the entity's Embassy projects. Expenses Operating and Nonoperating [Abstract] OTHER (INCOME) AND EXPENSES Express Lanes 95 LLC [Member] Represents information pertaining to the 95 Express Lanes, LLC joint venture. 95 Express Lanes, LLC joint venture Favorable court ruling that resolved certain U.S. government disputed items Represents information pertaining to a favorable court ruling that resolved certain items disputed by the United States government. Favorable Court Ruling Resolution of Certain United States Government Disputed Items [Member] Favorable Resolution Various Issues with United States Government 2001 through 2013 Period [Member] Favorable resolution of various issues with U.S. government related to 2001-2013 Represents information pertaining to the favorable resolution of various issues with the United States government related to the period 2001-2013. Fluor Lane Construction Joint Venture 95 [Member] Fluor-Lane 95 construction joint venture Represents the Fluor-Lane 95 construction joint venture. Fluor Lane Construction Joint Venture [Member] Represents the Fluor-Lane construction joint venture. Fluor-Lane construction joint venture Fluor SKM joint venture Fluor Sinclair Knight Merz Joint Venture [Member] Represents information pertaining to Fluor Sinclair Knight Merz joint venture. Foreign Securities [Member] International securities Securities which are issuances by corporations not within the country of domicile of the entity. Funding Commitment [Member] Represents a funding commitment of the entity. Future funding commitment Gain on Sale of Unconsolidated Interest in United Kingdom Telecommunications Company [Member] Gain on sale of unconsolidated interest in United Kingdom telecommunications company Represents information pertaining to the gain on sale of the entity's unconsolidated interest in a telecommunications company located in the United Kingdom. The entity's Global Services segment. Global Services Segment Global Services Segment [Member] Government Segment [Member] The entity's Government segment. Government Segment Represents the counterclaim filed by the client against the entity pertaining to its Greater Gabbard Offshore Wind Farm project. Greater Gabbard Off shore Wind Farm Project Counterclaim [Member] Greater Gabbard Offshore Wind Farm Project Client Counterclaim Greater Gabbard off shore Wind Farm Project Dispute [Member] Greater Gabbard Offshore Wind Farm Project Represents the dispute pertaining to the entity's Greater Gabbard Offshore Wind Farm project. Greater Gabbard Offshore Wind Farm Project Dispute The entity's Greater Gabbard Offshore Wind Farm Project. Greater Gabbard Offshore Wind Farm Project [Member] Greater Gabbard Offshore Wind Farm Project Income Tax Reconciliation Foreign Losses Benefited, Net Foreign losses benefited, net Represents the portion of the difference between total income tax expense (benefit) as reported in the income statement for the current period and the expected income tax expense (benefit) computed attributable to foreign losses benefited, net. Income Tax Reconciliation Statute Expirations and Tax Settlements Statute expirations and tax authority settlements Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to statute expirations and income tax settlements. Other permanent items, net Income Tax Reconciliation, Tax Exempt Income, Nondeductible Expense, Other, Net Represents the aggregate of the net amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes and nondeductible expenses not otherwise listed in the existing taxonomy. Increase (Decrease) in Deferred Compensation Plan Assets Deferred compensation trust The increase (decrease) during the reporting period in the deferred compensation plan assets. Industrial and Infrastructure Segment The entity's Industrial and Infrastructure segment. Industrial and Infrastructure Segment [Member] Infrastructure Joint Venture Project The entity's infrastructure joint venture project which consists of a 50/50 joint venture for a fixed-price transportation infrastructure project in California. Infrastructure Joint Venture Project [Member] Interstate 495 Capital Beltway HOT Lanes Project Interstate 495 Capital Beltway High Occupancy Toll Lanes Project [Member] Represents information pertaining to the Interstate 495 Capital Beltway High Occupancy Toll lanes project in Virginia. Interstate 95 High Occupancy Toll Lanes Project [Member] Interstate 95 HOT Lanes Project Represents the Interstate 95 High-Occupancy Toll Lanes Project in Virginia. Investments and Goodwill The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) goodwill. Investments and goodwill Joint Venture [Member] Represents an unincorporated venture owned and operated by a small group of ventures to accomplish a mutually beneficial venture or project. Joint ventures Letter of credit facility due 2014 Letter of Credit Facility due 2014 [Member] Represents the information pertaining to the letter of credit facility maturing in 2014. Line of Credit Facility, Contingent Increase to Maximum Borrowing Capacity Maximum borrowing capacity additional amount, subject to certain conditions Increased maximum borrowing capacity under the credit facility if any one or more of the existing banks or new banks agree to provide such increased commitment amount. Compensatory and economic damages Amount of compensatory and economic damages awarded to the plaintiff in the legal matter. Loss Contingency Damages Awarded Compensatory and Economic Value Punitive damages Amount of punitive damages awarded to the plaintiff in the legal matter. Loss Contingency, Damages Awarded Punitive Value Loss Contingency, Damages Awarded Punitive Value Reversed Punitive damages reversed and remanded back to trial court Amount of punitive damages awarded to the plaintiff in the legal matter reversed by the appellate court and remanded back to trial court. Loss Contingency Damages Awarded Subsequently Appealed and Reversed Value Represents the amount of damages awarded to the plaintiff in the legal matter during the period, subsequently appealed by the defendant and reversed. Damages awarded, subsequently appealed and reverse Middle East and Africa [Member] Represents information in the aggregate pertaining to the region of Middle East and the continent of Africa. Middle East and Africa Net Tax Reserve Reduction Disputed Domestic and International Items and Internal Revenue Service IRS Settlement [Member] Net tax reserve reduction, domestic and international disputed items and IRS settlement Represents information pertaining to a net reduction of tax reserves for various domestic and international disputed items and an Internal Revenue Service (IRS) settlement. Noncontrolling Interest Other Increase (Decrease) Represents the increase or decrease in noncontrolling interest balance not separately disclosed. Other noncontrolling interest transactions Number of Third Party Partners in Variable Interest Entity The number of third party partners in the variable interest entity as of the specific date. Number of third party partners in the VIE Nu Scale Power LLC [Member] Represents NuScale Power, LLC, a company in which the entity holds a majority interest. NuScale Oil and Gas Segment [Member] The entity's Oil and Gas segment. Oil and Gas Segment Operating Loss Carryforwards not Subject to Expiration Net operating loss carryforwards, indefinite carry forward period Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that are not subject to expiration dates. Operating Loss Carryforwards Subject to Expiration Net operating loss carryforwards, subject to expiration Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws that are subject to expiration dates. Other Comprehensive Income (Loss) before Reclassifications Net of tax Attributable to Noncontrolling Interest Amount after tax, before reclassification adjustments of other comprehensive income (loss) attributable to noncontrolling interests. Other comprehensive income (loss) before reclassifications attributable to noncontrolling interests Unrealized gain (loss) on derivative contracts Other Comprehensive Income (Loss) Derivatives Qualifying as Hedges Net of Tax Excluding Equity Method Investments Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Excludes the entity's proportionate share of the change in accumulated deferred hedging gain (loss)of its equity method investee after the date of acquisition. Other Comprehensive Income (Loss) Net of Tax Equity Method Investments Net of tax and reclassification adjustments amount of the entity's proportionate share of the change in accumulated other comprehensive income (loss) of its equity method investee after the date of acquisition. Ownership share of equity method investees' other comprehensive income After-tax amount of gain (loss) reclassified from AOCI into earnings Other Comprehensive Income (Loss) Reclassification Adjustment from AOCI on Derivatives Net of Tax, Excluding Equity Method Investments Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Excludes an entity's share of an equity investee's deferred hedging gain (loss). After-tax amount of gain (loss) recognized in OCI Other Comprehensive Income Unrealized Gain (Loss) on Derivatives Arising During Period Net of Tax, Excluding Equity Method Investments Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Excludes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Foreign currency contracts and other Represents the plan liabilities associated with the defined benefit plan assets which primarily consist of foreign currency exchange contracts and obligations to return collateral under securities lending arrangements. Plan Assets Related Liabilities, Foreign Currency Exchange Contracts and Other [Member] The entity's Power segment. Power Segment Power Segment [Member] Private activity bonds Private Activity Bonds [Member] Represents the private activity bond debt obligation. Consolidation of a variable interest entity Represents the cash inflow from consolidation of variable interest entity. Proceeds from Consolidation of Variable Interest Entity Proceeds from Sale of Investments and Other Assets Proceeds from sale of equity and cost method investments and other assets The cash inflow associated with the sale of investments and from sales of assets, other than those represented by other elements. Project Amount Project amount Represents the amount of the project. $30.46 - $41.77 Represents the exercise price range one of the outstanding stock options. Range One of Exercise Prices [Member] Represents the exercise price range three of the outstanding stock options. $68.36 - $80.12 Stock Option, Exercise Price Range Five to Six [Member] Range Two of Exercise Prices [Member] Represents the exercise price range two of the outstanding stock options. $42.11 - $62.50 Reclassification from Accumulated other Comprehensive Income Current Period Net of Tax Attributable to Noncontrolling Interest Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to noncontrolling interests. Amount reclassified from AOCI attributable to noncontrolling interests Regional Transportation District Denver Colorado [Member] Represents the Regional Transportation District in Denver, Colorado. RTD Research and Development Activities Cost Sharing Agreement [Member] Represents information pertaining to a cost-sharing agreement for certain research and development activities. Cost-sharing agreement, research and development activities Resolution of Challenges as to Reimbursability of Certain Costs from United States Government [Member] Resolution of U.S. government challenges as to reimbursability of certain costs Represents information pertaining to the resolution of challenges from the United States government as to the reimbursability of certain costs. Restricted Stock Units RSU and Restricted Stock [Member] Represents information in the aggregate pertaining to restricted stock units and restricted stock. Restricted stock units and restricted shares Revolving Loan and Financial Letter of Credit Facility Represents information pertaining to the Revolving Loan and Financial Credit Facility Agreement maturing in 2013. Revolving Loan and Financial Credit Facility Due 2013 [Member] Revolving Loan and Letter of Credit Facility 09 November 2012 [Member] November 2012 credit facility, as amended Represents information pertaining to the Revolving Loan and Letter of Credit Facility Agreement dated as of November 9, 2012, due as per the terms of the debt agreement, as amended. Revolving Loan and Letter of Credit Facility Due 2019 [Member] Credit Facility due 2019 Represents information pertaining to the Revolving Loan and Letter of Credit Facility Agreement maturing in 2019. 2010 Performance Letter of Credit Facility Represents information pertaining to the Revolving Performance Letter of Credit Facility Agreement maturing in 2015. Revolving Performance Letter of Credit Facility due 2015 [Member] Schedule of Allocation of Pension Plan Assets [Table Text Block] Schedule of target allocations and the weighted average actual allocations of plan assets Tabular disclosure of the target allocations and weighted average actual allocations for the major categories of plan assets, of pension plans and/or other employee benefit plans. Tabular disclosure of the fair value of each major category of plan assets of pension plans and/or other employee benefit plans, and the level within the fair value hierarchy in which the fair value measurements fall. Schedule of Fair Value of Pension Plan Assets [Table Text Block] Schedule of plan assets and liabilities of defined benefit pension plans, measured at fair value Tabular disclosure of information concerning assets located in identified geographic areas and the amount of revenue from external customers attributed to that country from which revenue is material. Schedule of Revenues from External Customers and Assets by Geographical Areas Table [Text Block] Operating Information by Geographic Area Conversion ratio Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Conversion Ratio Ratio applied to the conversion upon vesting of equity-based payment instruments, excluding stock (or unit) options, for example but not limited to, one unit converted to two shares. The estimated amount of dividend per share to be paid to holders of the underlying shares (expected dividends) over the option's term. Expected annual dividend (in dollars per share) Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Expected Annual Dividend Amount Per Share Blend of historical and implied volatility Share Based Compensation Arrangement by Share Based Payment Award, Fair Value, Expected Volatility Assumptions, Historic and Implied Volatility Blend This element represents the blend of historical and implied volatility for estimating volatility of stock option prices. Share Based Compensation Plan Activity Value Stock-based plan activity Represents the net amount of share-based compensation plan activity, which may include (1) value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited; (2) value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP); and (3) the amount of recognized equity-based compensation during the period. Single customer Represents information pertaining to a single customer of the entity. Single Customer [Member] Statute expirations and tax settlements Statute Expirations and Tax Settlements The amount of decreases/increases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations and/or settlements with taxing authorities. St Joe Minerals Corporation and the Doe Run Company Additional Litigation Matters [Member] Represents information pertaining to additional litigation matters pertaining to St. Joe Minerals Corporation and The Doe Run Company (St. Joe and Doe Run) not separately disclosed. St. Joe and Doe Run additional litigation matters St Joe Minerals Corporation and the Doe Run Company Litigation Matter December 2010, December 2011 Judgment Appeal And Opinion [Member] Represents the appellate court decision on the December 2011 appeal of the December 2010 litigation judgment pertaining to St. Joe Minerals Corporation and The Doe Run Company (St. Joe and Doe Run). St. Joe and Doe Run December 2010 litigation, December 2011 judgment, appeal and opinion St Joe Minerals Corporation and the Doe Run Company Litigation Matter December 2010 [Member] Represents information pertaining to the December 2010 litigation matter pertaining to St. Joe Minerals Corporation and The Doe Run Company (St. Joe and Doe Run). St. Joe and Doe Run December 2010 litigation Represents information pertaining to St. Joe Minerals Corporation (St. Joe) and The Doe Run Company ("Doe Run"). St. Joe and Doe Run St Joe Minerals Corporation and the Doe Run Company [Member] U.S. Department of Energy [Member] U.S. Department of Energy Represents the United States Department of Energy. US Government and Government Agencies and Authorities Customer [Member] Represents information pertaining to various agencies of the United States government as a customer. Various agencies of the U.S. government Variable Interest Entities. Variable Interest Entities Variable Interest Entities Disclosure [Text Block] Disclosure of variable interest entities (VIE), including, but not limited to the nature, purpose, size, and activities of the VIE, the carrying amount and classification of consolidated assets that are collateral for the VIE's obligations, lack of recourse if creditors (or beneficial interest holders) of a consolidated VIE have no recourse to the general credit of the primary beneficiary. An enterprise that holds a significant variable interest in a VIE but is not the primary beneficiary may disclose the nature of its involvement with the VIE and when that involvement began, the nature, purpose, size, and activities of the VIE and the enterprise's maximum exposure to loss as a result of its involvement with the VIE. Variable Interest Entities Variable Interest Entities The entire disclosure for a variable interest entity (VIE), including but not limited to, judgments and assumptions in determining whether to consolidate and in identifying the primary beneficiary, gain (loss) recognized on the initial consolidation of the VIE, terms of arrangements, amounts and classification of the VIE's assets and liabilities, and the entity's maximum exposure to loss. Variable Interest Entity Disclosure [Text Block] Variable Interest Entity Disclosure [Text Block] Virginia Department of Transportation [Member] Virginia Department of Transportation Represents the Virginia Department of Transportation (VDOT). Major Accounting Policies Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable and contract work in progress Accounts and notes receivable, net ($190,715 and $220,705 related to VIEs) Accounts, Notes, Loans and Financing Receivable, Net, Current Accounts and notes receivable Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block] Other Noncurrent Liabilities Trade accounts payable Trade accounts payable ($313,088 and $311,892 related to VIEs) Accounts Payable, Current Defined Benefit Pension and Postretirement Plans Defined benefit pension and postretirement plan adjustments Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment, accumulated depreciation Unrealized gain (loss) on derivative contracts Unrealized Gain (Loss) on Derivative Contracts Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Unrealized Gain (Loss) on Available-for-Sale Securities Accumulated Net Unrealized Investment Gain (Loss) [Member] Unrealized gain (loss) on debt securities Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net, balance as of beginning of period Accumulated Other Comprehensive Income (Loss), Net, balance as of end of period Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Foreign currency translation adjustment Foreign Currency Translation Accumulated Translation Adjustment [Member] Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-In Capital Additional Paid-in Capital [Member] Adjustments to reconcile net earnings to cash provided (utilized) by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Recognized compensation expense Allocated Share-based Compensation Expense Recorded compensation cost for stock based payment arrangements, net of tax Allocated Share-based Compensation Expense, Net of Tax Bad debt recovery Allowance for Doubtful Accounts Receivable, Recoveries Amortization of intangibles Amortization of Intangible Assets Anti-dilutive securities not included above (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Arrangements and Non-arrangement Transactions [Domain] Asia Pacific (includes Australia) Asia Pacific [Member] TOTAL ASSETS Total assets by segment Assets ASSETS Assets [Abstract] Total current assets Assets, Current Assets, Current [Abstract] CURRENT ASSETS CURRENT ASSETS, VIEs Available-for-sale securities Available-for-sale Securities Marketable securities, current Available-for-sale Securities, Debt Securities, Current Marketable securities, noncurrent Available-for-sale Securities, Debt Securities, Noncurrent Proceeds from the sales and maturities of available-for-sale securities Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds Award Date [Axis] Award Date [Domain] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Base Rate [Member] Alternative base rate borrowings Advance billings on contracts related Advance billings on contracts ($277,639 and $327,820 related to VIEs) Billings in Excess of Cost Equity bridge loan Bridge Loan Buildings Building [Member] Buildings and improvements Buildings and Improvements, Gross Capital loss carryforwards Capital Loss Carryforward [Member] Carrying Value Total, measured at fair value and not measured at fair value Reported Value Measurement [Member] Cash Cash Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash and cash equivalents ($458,846 and $488,426 related to variable interest entities ("VIEs")) Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash equivalents Cash Equivalents, at Carrying Value Cash Paid for Interest and Taxes Cash Flow, Supplemental Disclosures [Text Block] Cash outflows from discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Schedule of changes in the benefit obligations and plan assets, the funded status of the plans for U.S and Non-U.S pension plans and postretirement benefit plans Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Variable Interest Entity, Classification [Domain] Commercial paper Commercial Paper [Member] CONTINGENCIES AND COMMITMENTS Commitments and Contingencies Contingencies and Commitments Contingencies and Commitments Commitments and Contingencies Disclosure [Text Block] Commodity contracts Commodity Contract [Member] DIVIDENDS DECLARED PER SHARE (in dollars per share) Common Stock, Dividends, Per Share, Declared Common Stock Common Stock [Member] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, authorized shares (in shares) Common Stock, Shares Authorized Common stock, issued shares (in shares) Common Stock, Shares, Issued Common stock, outstanding shares (in shares) Common Stock, Shares, Outstanding Common - authorized 375,000,000 shares ($0.01 par value); issued and outstanding - 157,599,815 and 161,287,818 shares in 2014 and 2013, respectively Common Stock, Value, Issued Retirement Benefits COMPREHENSIVE INCOME ATTRIBUTABLE TO FLUOR CORPORATION Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other Comprehensive Income (Loss) Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest LESS: COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Percentage of the entity's consolidated revenue from customer Concentration Risk, Percentage Concentration Risk Type [Domain] Consolidation Items [Axis] Consolidation Items [Domain] Principles of Consolidation Consolidation, Policy [Policy Text Block] Engineering and Construction Contracts Construction Contractors, Policy [Policy Text Block] Construction in progress Construction in Progress, Gross Contracts receivable, claims and uncertain amounts Contracts Receivable, Claims and Uncertain Amounts Contracts Receivable, Claims and Uncertain Amounts, Fiscal Year Maturity [Abstract] Recognized claims against clients If-converted value Convertible Debt, Fair Value Disclosures 1.5% Convertible Senior Notes due February 15, 2024 1.5% Convertible Senior Notes Convertible Debt [Member] Schedule of liability and equity components of the 2004 Notes Convertible Debt [Table Text Block] Corporate debt securities Corporate Debt Securities [Member] Corporate and other Corporate, Non-Segment [Member] Pre-tax gain on sale of unconsolidated interest Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments Total cost of revenue Cost of Sales [Member] TOTAL COST OF REVENUE Total cost of revenue Cost of Services Various accounts, primarily cost of revenue and corporate general and administrative expense Costs and Expenses Contract work in progress Contract work in progress ($264,139 and $238,895 related to VIEs) Costs in Excess of Billings, Current Counterparty Name [Axis] Additional partners Co-venturer [Member] Credit Facility [Axis] Credit Facility [Domain] Federal Current Federal Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit) Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] State and local Current State and Local Tax Expense (Benefit) Customer concentration Customer Concentration Risk [Member] Aggregate amount of debt Debt and Capital Lease Obligations Debt conversion, amount of original debt Debt Conversion, Original Debt, Amount Current: Debt, Current [Abstract] Financing Arrangements Financing Arrangements Debt Disclosure [Text Block] Debt Instrument [Axis] Carrying value of the equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Debt Instrument, Convertible, Conversion Price Conversion price (in dollars per share) Conversion rate per $1,000 principal amount of Notes (in shares) Debt Instrument, Convertible, Conversion Ratio Current trigger price (in dollars per share) Debt Instrument, Convertible, Stock Price Trigger Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable Debt Instrument, Convertible, Threshold Consecutive Trading Days Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable Debt Instrument, Convertible, Threshold Trading Days Variable interest basis Debt Instrument, Description of Variable Rate Basis Issue price of notes Debt Instrument, Face Amount Debt Debt Instrument, Fair Value Disclosure Effective interest rate of convertible debt instrument (as a percent) Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Interest Rate, Stated Percentage Debt instrument interest rate (as a percent) Debt interest rate (as a percent) Financing Arrangements Debt instruments Debt Instrument [Line Items] Debt Instrument, Name [Domain] Redemption price as a percentage of principal Debt Instrument, Redemption Price, Percentage Redemption price as a percentage of the principal amount of bonds (as a percent) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Redemption price as a percentage of the principal amount (as a percent) Schedule of Long-term Debt Instruments [Table] Notes payable, maturity period Debt Instrument, Term Debt securities Debt Securities [Member] Deferred compensation and retirement obligations included in noncurrent liabilities Deferred Compensation Cash-based Arrangements, Liability, Classified, Noncurrent Deferred compensation trusts Deferred Compensation Plan Assets Federal Deferred Federal Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Deferred taxes Deferred Income Taxes and Tax Credits Total deferred Deferred Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Total deferred tax liabilities Deferred Tax Liabilities, Gross State and local Deferred State and Local Income Tax Expense (Benefit) Capital loss carryforward Deferred Tax Assets, Capital Loss Carryforwards Revenue recognition Deferred Tax Assets, Deferred Income Tax basis of investments in excess of book basis Deferred Tax Assets, Equity Method Investments Total deferred tax assets Deferred Tax Assets, Gross Deferred tax assets, net of deferred tax liabilities Deferred Tax Assets, Net Deferred tax assets (liabilities), net Deferred Tax Assets, Net, Classification [Abstract] Deferred taxes Deferred Tax Assets, Net, Current Deferred taxes Deferred Tax Assets, Net, Noncurrent Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Deferred tax assets: Deferred Tax Assets, Net [Abstract] Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Other Deferred Tax Assets, Other Other comprehensive loss Deferred Tax Assets, Other Comprehensive Loss Foreign tax credits Deferred Tax Assets, Tax Credit Carryforwards, Foreign Accrued liabilities not currently deductible: Deferred Tax Assets, Tax Deferred Expense [Abstract] Employee time-off accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Project and non-project reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves Workers' compensation insurance accruals Deferred Tax Assets, Tax Deferred 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Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax Actual return on plan assets Defined Benefit Plan, Actual Return on Plan Assets Actual return on plan assets, assets sold during the period Defined Benefit Plan, Actual Return on Plan Assets Sold During Period Actual return on plan assets, assets still held at reporting date Defined Benefit Plan, Actual Return on Plan Assets Still Held Actuarial (gain) loss Defined Benefit Plan, Actuarial Gain (Loss) Recognized net actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amounts recognized in the Consolidated Balance Sheet Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract] Amount of accumulated other comprehensive loss expected to be recognized as components of net periodic pension expense Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year Pension assets included in other assets Defined Benefit Plan, Assets for Plan Benefits, Noncurrent Health care cost trend rates Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] Discount rates (as a percent) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Rates of increase in compensation levels (as a percent) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Discount rates (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Expected long-term rates of return on assets (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Rates of increase in compensation levels (as a percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 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one-percentage-point decrease on the post-retirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Effect of a one-percentage-point decrease on the total of service and interest cost components Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components Effect of a one-percentage-point increase on the post-retirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Effect of a one-percentage-point increase on the total of service and interest cost components Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Estimated future benefit payments Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] 2019 - 2023 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 2014 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2018 Defined Benefit Plan, Expected Future Benefit Payments, Year Five 2017 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2016 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2015 Defined Benefit Plan, Expected Future Benefit Payments, Year Two Expected return on assets Defined Benefit Plan, Expected Return on Plan Assets Plan assets at beginning of year Plan assets at end of year Defined Benefit Plan, Fair Value of Plan Assets Plan assets, net Currency translation Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) Currency translation Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets Funded status Defined Benefit Plan, Funded Status of Plan Health care cost trend rates in next fiscal year (as a percent) Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year Defined Benefit Plan, Information about Plan Assets [Abstract] Target allocations and the weighted average actual allocations of plan assets Interest cost Defined Benefit Plan, Interest Cost Net periodic pension expense Defined Benefit Plan, Net Periodic Benefit Cost Other Defined Benefit Plan, Other Changes Accumulated benefit obligation exceeded plan assets Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation Plan amendments Defined Benefit Plan, Plan Amendments Pension plans with accumulated benefit obligations in excess of plan assets Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract] Projected benefit obligations in excess of plan assets Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation Fair value of plan assets for plans with projected benefit obligations in excess of plan assets Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets (Gain on curtailment)/loss on settlement Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Service cost Defined Benefit Plan, Service Cost Expected future benefit payments Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year Target allocation (as a percent) Defined Benefit Plan, Target Plan Asset Allocations Target allocation, maximum (as a percent) Defined Benefit Plan, Target Plan Asset Allocations Range Maximum Target allocation, minimum (as a percent) Defined Benefit Plan, Target Plan Asset Allocations Range Minimum Health care cost trend rates in 2019 and thereafter (as a percent) Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Defined Benefit Plan, Actual Plan Asset Allocations Weighted average actual allocation (as a percent) For determining projected benefit obligation at year-end: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] For determining net periodic cost for the year: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Defined contribution retirement plans, expense recognized Defined Contribution Plan, Cost Recognized Depreciation of fixed assets Depreciation Derivative, by Nature [Axis] Derivative Contract [Domain] Asset Derivatives Derivative assets Derivative Asset, Fair Value, Gross Asset Liability Derivatives Derivative Liability, Fair Value, Gross Liability Derivative liabilities Derivative Instrument [Axis] Derivatives and Hedging Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Hedging Relationship [Axis] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) Derivative gain (loss) Derivative Instruments, Gain (Loss) [Line Items] Derivative, Maturity Date Derivative contract maturity Derivatives, Fair Value Derivatives, Fair Value [Line Items] Derivatives and Hedging Derivatives, Policy [Policy Text Block] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Director [Member] Directors Stock-Based Plans Stock-Based Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Loss from discontinued operations in connection with reassessment of estimated loss contingencies, net of taxes Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax Discontinued Operations Loss from discontinued operations in connection with reassessment of estimated loss contingencies, taxes Discontinued Operation, Tax Effect of Adjustment to Prior Period Gain (Loss) on Disposal Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Name [Domain] Dividends ($0.64, $0.64 and $0.50 per share for the year ended December 31, 2013, 2012 and 2011, respectively) Dividends, Common Stock Earnings Per Share Net earnings (in dollars per share) Earnings Per Share, Basic Basic net earnings (in dollars per share) Basic EPS attributable to Fluor Corporation: Earnings Per Share, Basic [Abstract] BASIC EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO FLUOR CORPORATION SHARES USED TO CALCULATE EARNINGS PER SHARE Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic EPS: Earnings Per Share, Basic, Other Disclosures [Abstract] Net earnings (in dollars per share) Earnings Per Share, Diluted Diluted net earnings (in dollars per share) Diluted EPS attributable to Fluor Corporation: Earnings Per Share, Diluted [Abstract] DILUTED EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO FLUOR CORPORATION Earnings Per Share, Diluted, Other Disclosures [Abstract] Diluted EPS: Earnings Per Share Earnings Per Share [Text Block] Effective tax rate, continuing operations (as a percent) Effective Income Tax Rate Reconciliation, Percent Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Fourth quarter pre-tax income (charges) Effect of Fourth Quarter Events, Amount Effect of Fourth Quarter Event Type [Axis] Effect of Fourth Quarter Events [Line Items] Effect of fourth quarter events Effect of Fourth Quarter Events, Type [Domain] Accrued salaries, wages and benefits Accrued salaries, wages and benefits ($53,426 and $64,064 related to VIEs) Employee-related Liabilities, Current Balance of unamortized expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period of recognition of unamortized expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Unamortized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Recognized tax benefits for stock based payment arrangements Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock Options Employee Stock Option [Member] Equity Component [Domain] Equity Method Investment, Realized Gain (Loss) on Disposal Loss (gain) on sales of equity method investments Equity Method Investments Investment balance Equity securities Equity Securities [Member] Fair Value Total Estimate of Fair Value Measurement [Member] Eurodollar [Member] Eurodollar borrowings Europe Europe [Member] Excess tax benefit from stock-based plans Excess Tax Benefit from Share-based Compensation, Financing Activities Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefit from stock-based plans Executive Officer [Member] Executives Fair value of assets and liabilities measured on recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurements, Recurring and Nonrecurring [Table] Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3): Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, by Balance Sheet Grouping [Table] Schedule of carrying values and estimated fair values of financial instruments not required to be measured at fair value in the Condensed Consolidated Balance Sheet Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, Hierarchy [Axis] Liability Class [Axis] Measurement Basis [Axis] Measurement Frequency [Axis] Fair Value Measurement [Domain] Fair Value of Financial Instruments Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Hedging instruments designated as fair value hedges Fair Value Hedging [Member] Fair Value, Inputs, Level 1 [Member] Level 1 Level 2 Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value by Liability Class [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Hierarchy [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Balance at beginning of year Balance at end of year Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Finite lived intangible assets Finite-Lived Intangible Assets [Line Items] Useful lives of intangible assets with finite lives Finite-Lived Intangible Asset, Useful Life Foreign Foreign Tax Authority [Member] Foreign currency contracts Foreign Exchange Contract [Member] Defined Benefit Non-U.S. Pension Plans Foreign Pension Plan, Defined Benefit [Member] Furniture and fixtures Furniture and Fixtures [Member] Gain Contingencies, Nature [Axis] Gain Contingency, Nature [Domain] Net Gains Recognized in Earnings Gain (Loss) on Fair Value Hedges Recognized in Earnings Amount of Gain (Loss) Recognized in general and administrative expense Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Gain on sale of equity and cost method investments Gain (Loss) on Sale of Investments Gain on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Corporate general and administrative expense Corporate general and administrative expense General and Administrative Expense Corporate general and administrative expense General and Administrative Expense [Member] Goodwill Goodwill Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill, Impairment Loss Goodwill impaired Guarantor Obligations, Nature [Axis] Guarantees Guarantor Obligations [Line Items] Estimated performance guarantees outstanding Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Nature [Domain] Guarantees Guarantees Guarantees [Text Block] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Relationship [Domain] Marketable securities, current Held-to-maturity Securities, Current Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Intangible assets with indefinite lives impaired Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use Income Amounts Attributable to Parent, Disclosures [Abstract] Amounts attributable to Fluor Corporation: AMOUNTS ATTRIBUTABLE TO FLUOR CORPORATION Earnings from continuing operations Income (Loss) from Continuing Operations Attributable to Parent U.S. earnings before taxes Income (Loss) from Continuing Operations before Income Taxes, Domestic EARNINGS FROM CONTINUING OPERATIONS BEFORE TAXES Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Foreign earnings before taxes Income (Loss) from Continuing Operations before Income Taxes, Foreign U.S. and foreign earnings before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] EARNINGS FROM CONTINUING OPERATIONS Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Earnings from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Income (Loss) from Continuing Operations, Per Diluted Share Earnings from continuing operations (in dollars per share) LOSS FROM DISCONTINUED OPERATIONS, NET OF TAXES Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss From discontinued operations, net of taxes Loss from discontinued operations, net of taxes Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Loss from discontinued operations, net of taxes (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Loss from discontinued operations, net of taxes (in dollars per share) Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Losses from equity method investments, net of distributions CONDENSED CONSOLIDATED STATEMENT OF EARNINGS Disposal Group Name [Axis] Discontinued Operations Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Taxes Income Taxes Income Tax Disclosure [Text Block] Income tax payments, net of refunds Income Taxes Paid, Net Income Tax Examination [Line Items] Tax audit Income Tax Examination [Table] Income tax benefit (expense) Income Tax Expense (Benefit) INCOME TAX EXPENSE Income tax expense (benefit) included in the Consolidated Statement of Earnings Income Tax Expense (Benefit), Continuing Operations [Abstract] Reconciliation of U.S. statutory federal income tax expense to income tax expense Effective Income Tax Rate Reconciliation, Amount [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] Valuation allowance, net Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount U.S. statutory federal tax expense Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Noncontrolling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Increase (decrease) in taxes resulting from: Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract] State and local income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Other changes to unrecognized tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount Income Tax Uncertainties [Abstract] Unrecognized tax benefits Accounts and notes receivable, net Increase (Decrease) in Accounts and Notes Receivable Trade accounts payable Increase (Decrease) in Accounts Payable, Trade Accrued liabilities Increase (Decrease) in Accrued Liabilities Advance billings on contracts Increase (Decrease) in Customer Advances Deferred compensation obligation Increase (Decrease) in Deferred Compensation (Increase) decrease in: Increase (Decrease) in Operating Assets [Abstract] Changes in operating assets and liabilities Increase (Decrease) in Operating Capital (Increase) decrease in operating assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Increase (decrease) in: Increase (Decrease) in Operating Liabilities [Abstract] Other current assets Increase (Decrease) in Other Current Assets Other assets Increase (Decrease) in Other Operating Assets Other liabilities Increase (Decrease) in Other Operating Liabilities Retirement plan contributions, net of accruals Increase (Decrease) in Pension and Postretirement Obligations Increase (Decrease) in Shareholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Contract work in progress Increase (Decrease) in Unbilled Receivables Conversion equivalent of dilutive convertible debt (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Employee stock options, restricted stock units and shares and Value Driver Incentive units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Carrying value of intangible assets Intangible Assets, Net (Excluding Goodwill) Goodwill and Intangible Assets Intangible Assets, Net (Including Goodwill) [Abstract] Interest expense Interest Expense Interest expense Debt instrument, coupon interest Interest Expense, Debt Interest expense Interest Expense [Member] Interest income (expense), net Interest Income (Expense), Net Cash paid for interest Interest Paid Interest rate contracts Interest Rate Contract [Member] Internal Revenue Service (IRS) [Member] IRS Intercompany Intersegment Eliminations [Member] Interest income Investment Income, Interest Investments by Secondary Categorization [Domain] Investment Secondary Categorization [Axis] Land Land Lease Obligations Leases of Lessee Disclosure [Text Block] Lease Obligations Letters of credit Letter of Credit [Member] TOTAL LIABILITIES AND EQUITY Liabilities and Equity LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Total current liabilities Liabilities, Current CURRENT LIABILITIES CURRENT LIABILITIES, VIEs Liabilities, Current [Abstract] Engineering and Construction Contracts Liabilities for Long-term Contracts or Programs [Abstract] Amount outstanding under credit facilities Line of Credit Facility, Amount Outstanding Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other borrowings Line of Credit [Member] Litigation Case [Axis] Litigation Case [Domain] Litigation resolution Litigation Settlement, Amount London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) borrowings Principal amount and carrying value of the liability component Long-term Debt Long-Term: Long-term Debt, Unclassified [Abstract] Convertible senior notes and other borrowings Long-term Debt, Current Maturities Principal amount and carrying value of the liability component LONG-TERM DEBT DUE AFTER ONE YEAR Long-term Debt, Excluding Current Maturities Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Investments Long-term Investments Litigation and dispute resolution Loss Contingencies [Line Items] Loss Contingencies [Table] Loss Contingency, Damages Sought, Value Claim amount Loss contingency charge in period Loss Contingency, Loss in Period Charges and provisions included in segment profit Number of plaintiffs Loss Contingency, Number of Plaintiffs Number of lawsuits Loss Contingency, Pending Claims, Number Machinery and equipment Machinery and Equipment, Gross Machinery and equipment Machinery and Equipment [Member] Customer [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Management [Member] Executives and directors Marketable securities, current ($64,123 and $64,084 related to VIEs) Marketable securities, current Marketable Securities, Current Marketable securities, noncurrent Marketable Securities, Noncurrent Marketable Securities Marketable Securities, Policy [Policy Text Block] Reconciling item Segment Reconciling Items [Member] Maximum Maximum [Member] Minimum Minimum [Member] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Attributable to noncontrolling interest Noncontrolling Interest [Line Items] Entity's interest in joint venture (as a percent) Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest [Table] Money market funds Money Market Funds [Member] Changes in AOCI balances by component (after-tax) attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Company contributions to multiemployer pension plans Multiemployer Plan, Period Contributions Multiemployer pension plans Multiemployer Plans [Abstract] 5.625% Municipal Bonds Municipal Bonds [Member] Customer [Domain] Cash utilized by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash utilized by investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations LESS: NET EARNINGS ATTRIBUTABLE TO NONCONTROLLING INTERESTS Net earnings attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net earnings (in dollars) Net of tax and noncontrolling interest NET EARNINGS ATTRIBUTABLE TO FLUOR CORPORATION Net Income (Loss) Available to Common Stockholders, Basic Recent Accounting Pronouncements Recent Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Noncontrolling Interests Acquisition and other noncontrolling interest transactions Noncontrolling Interest, Increase from Business Combination Partner contributions in noncontrolling interests Noncontrolling Interest, Increase from Subsidiary Equity Issuance Noncontrolling Interests Attributable to Noncontrolling Interest: Noncontrolling Interest [Member] Notes payable, including noncurrent portion Notes Payable to Banks [Member] Notes payable Notes receivable, including noncurrent portion Notes Receivable, Fair Value Disclosure Number of Reportable Segments Number of business segments Total segment profit (loss) Total segment profit Operating Income (Loss) Obligations for minimum rentals under non-cancelable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2018 Operating Leases, Future Minimum Payments, Due in Five Years 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2015 Operating Leases, Future Minimum Payments, Due in Two Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Net rental expense Operating Leases, Rent Expense, Net Non-U.S. net operating loss carryforwards Operating Loss Carryforwards Net operating loss carryforwards Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Table] Reportable segments Operating Segments [Member] Principles of Consolidation Principles of Consolidation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other accrued liabilities Other accrued liabilities ($27,526 and $25,517 related to VIEs) Other Accrued Liabilities, Current Other Other Security Investments [Member] Other current assets Other Assets, Current Other assets Other Assets [Member] Other Other Assets, Noncurrent Future funding amount Other Commitment Other Commitments [Axis] Other Commitments [Domain] Unrealized gain (loss) on debt securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Total other comprehensive income (loss), Before-Tax Amount Other Comprehensive Income (Loss), before Tax Other comprehensive income (loss), Before-Tax Amount: Other Comprehensive Income (Loss), before Tax [Abstract] Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-Tax Amount Other Comprehensive (Income) Loss, before Tax, Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) attributable to Fluor Corporation, Before-Tax Amount Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent After-tax decrease in accumulated other comprehensive loss for curtailment accounting event Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX Total other comprehensive income (loss), Net-of-Tax Amount Other Comprehensive Income (Loss), Net of Tax OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX: Other comprehensive income (loss), Net-of-Tax Amount: Other Comprehensive Income (Loss), Net of Tax [Abstract] Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest Net other comprehensive income (loss) attributable to noncontrolling interests Other comprehensive income (loss) attributable to Fluor Corporation, Net-of-Tax Amount Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Defined benefit pension and postretirement plan adjustments Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total other comprehensive income (loss), Tax Benefit (Expense) Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), Tax Benefit (Expense): Other Comprehensive Income (Loss), Tax [Abstract] Other comprehensive income (loss) attributable to Fluor Corporation, Tax Benefit (Expense) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other current assets Other Current Assets [Member] Other accrued liabilities Other Current Liabilities [Member] Other debt securities Other Debt Obligations [Member] NONCURRENT LIABILITIES Other Liabilities, Noncurrent Other Noncurrent Liabilities Other items Other Noncash Income (Expense) Noncurrent liabilities Other Noncurrent Liabilities [Member] Other Nonoperating Expense Non-operating expense items Income recognized Other Nonrecurring Income Postretirement Benefit Other Postretirement Benefit Plan, Defined Benefit [Member] Other-than-temporary impairment of available-for-sale securities Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Total Shareholders' Equity Parent [Member] Parties to Contractual Arrangement [Axis] Parties to Contractual Arrangement [Domain] Limited Partnerships Partnership Interest [Member] Partnership Partnership [Member] Settlement of U.S. Treasury rate lock agreements Payments for Hedge, Financing Activities Cash paid during the year Payments for Operating Activities [Abstract] Other items Payments for (Proceeds from) Other Investing Activities Repurchase of common stock Payments for Repurchase of Common Stock Debt issuance costs Payments of Debt Issuance Costs Dividends paid Payments of Ordinary Dividends, Common Stock Distributions paid to noncontrolling interests Distributions paid to noncontrolling interest holders Payments of Ordinary 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Proceeds from sales of equity method investments Proceeds from disposal of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Stock options exercised Proceeds from Stock Options Exercised NET EARNINGS Net earnings NET EARNINGS Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Property, Plant and Equipment, Type [Axis] Gross property, plant and equipment Property, plant and equipment, at cost Property, Plant and Equipment, Gross PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment, Gross [Abstract] Property plant and equipment Property, Plant and Equipment [Line Items] Property, plant and equipment, net Property, Plant and Equipment, Net Property, plant and equipment ("PP&E") ((net of accumulated depreciation of $1,135,634 and $1,106,925) (net PP&E of $72,548 and $87,774 related to VIEs)) PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment Property, Plant and 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Schedule of Assumptions Used [Table Text Block] Schedule of after-tax amount of gain (loss) recognized in OCI and reclassified from AOCI into earnings associated with derivative instruments designated as cash flow hedges Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Changes in operating assets and liabilities as shown in the Consolidated Statement of Cash Flows Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Income tax expense (benefit) included in the Consolidated Statement of Earnings Schedule of tax effects of components of other comprehensive income (loss) ("OCI") Comprehensive Income (Loss) [Table Text Block] Consolidated debt Schedule of Debt [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Tax effects of significant temporary differences leading to deferred tax assets and liabilities Schedule 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[Table] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of External Revenue, Segment Profit and Total Assets by Segment Summary of restricted stock, restricted stock unit and stock option activity Schedule of Share-based Compensation, Activity [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Summary of information related to options outstanding Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Fair value on the grant date and the significant assumptions used in the Black-Scholes option-pricing model Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Variable Interest Entities [Table] Segments [Domain] Geographical [Domain] Operating Information by Segment 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