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Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 4 EBITDA 2 fwlt_SegmentReportingOperatingIncomeLoss fwlt false credit duration Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and... false false false false false false false false false false false terselabel false 1 false true false false 90239000 90239 [1] false false false 2 false true false false 161962000 161962 [2] false false false 3 false true false false 201519000 201519 [3] false false false 4 false true false false 267546000 267546 [4] false false false xbrli:monetaryItemType monetary Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and extraordinary items. 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No authoritative reference available. false 8 Income before income taxes-Total 2 fwlt_IncomeBeforeIncomeTaxesTotal fwlt false debit duration Sum of operating profit and nonoperating income (expense) before income taxes and including the portion attributable to... false false false false false false false false false false false label false 1 false true false false 78057000 78057 false false false 2 false true false false 154895000 154895 false false false 3 false true false false 175033000 175033 false false false 4 false true false false 247270000 247270 false false false xbrli:monetaryItemType monetary Sum of operating profit and nonoperating income (expense) before income taxes and including the portion attributable to noncontrolling interest. No authoritative reference available. false 9 Less: Provision for income taxes 2 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 15409000 15409 false false false 2 false true false false 27561000 27561 false false false 3 false true false false 37019000 37019 false false false 4 false true false false 45564000 45564 false false false xbrli:monetaryItemType monetary The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 11 Less: Net income attributable to noncontrolling interests 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 3790000 3790 false false false 2 false true false false 5130000 5130 false false false 3 false true false false 7096000 7096 false false false 4 false true false false 6639000 6639 false false false xbrli:monetaryItemType monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 false 12 Net income attributable to Foster Wheeler AG-Total 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 58858000 58858 false false false 2 false true false false 122204000 122204 false false false 3 false true false false 130918000 130918 false false false 4 false true false false 195067000 195067 false false false xbrli:monetaryItemType monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 false 13 Contract profit changes 2 fwlt_ContractProfitChanges fwlt false credit duration The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or... false false false false false false false false false false false false 1 false true false false 8600000 8600 false false false 2 false true false false 20200000 20200 false false false 3 false true false false 33700000 33700 false false false 4 false true false false 26200000 26200 false false false xbrli:monetaryItemType monetary The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or costs relating to the revaluation of work performed on contracts in prior periods. No authoritative reference available. false 15 Amount of provision from the regular revaluation of asbestos liability and related asset included in EBITDA in C&F Group 2 fwlt_NetAsbestosRelatedProvisionGain fwlt false debit duration Net (gain)/loss for charges on the revaluation of the asbestos liability and related asset. false false false false false false false false false false false verboselabel false 1 false true false false 2344000 2344 false false false 2 false true false false 1756000 1756 false false false 3 false true false false 1597000 1597 false false false 4 false true false false 3506000 3506 false false false xbrli:monetaryItemType monetary Net (gain)/loss for charges on the revaluation of the asbestos liability and related asset. No authoritative reference available. false 16 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1005496000 1005496 false false false 2 false true false false 1308801000 1308801 false false false 3 false true false false 1951069000 1951069 false false false 4 false true false false 2573324000 2573324 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 17 Global E&C Group [Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 6 USD true false false false fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalECGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 18 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 19 Operating revenues (third-party) 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false 842461000 842461 false false false 2 false true false false 1030471000 1030471 false false false 3 false true false false 1622145000 1622145 false false false 4 false true false false 1982883000 1982883 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 20 EBITDA 2 fwlt_SegmentReportingOperatingIncomeLoss fwlt false credit duration Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and... false false false false false false false false false false false terselabel false 1 false true false false 85460000 85460 [1] false false false 2 false true false false 130628000 130628 [2] false false false 3 false true false false 185393000 185393 [3] false false false 4 false true false false 211910000 211910 [4] false false false xbrli:monetaryItemType monetary Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and extraordinary items. No authoritative reference available. false 29 Contract profit changes 2 fwlt_ContractProfitChanges fwlt false credit duration The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or... false false false false false false false false false false false false 1 false true false false 8100000 8100 false false false 2 false true false false 18000000 18000 false false false 3 false true false false 25200000 25200 false false false 4 false true false false 24500000 24500 false false false xbrli:monetaryItemType monetary The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or costs relating to the revaluation of work performed on contracts in prior periods. No authoritative reference available. false 30 Amount of curtailment gain on closure of U.K. pension plan 2 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 20086000 20086 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary The aggregate amount of net gain or loss recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h false 33 Global Power Group [Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 10 USD true false false false fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_GlobalPowerGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 34 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 35 Operating revenues (third-party) 2 us-gaap_SegmentReportingInformationRevenueFromExternalCustomers us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false 163035000 163035 false false false 2 false true false false 278330000 278330 false false false 3 false true false false 328924000 328924 false false false 4 false true false false 590441000 590441 false false false xbrli:monetaryItemType monetary Amount of revenue from external customers for the reportable segment. Must be disclosed if the amounts (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a false 36 EBITDA 2 fwlt_SegmentReportingOperatingIncomeLoss fwlt false credit duration Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and... false false false false false false false false false false false terselabel false 1 false true false false 26396000 26396 [1] false false false 2 false true false false 53780000 53780 [2] false false false 3 false true false false 56279000 56279 [3] false false false 4 false true false false 102563000 102563 [4] false false false xbrli:monetaryItemType monetary Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and extraordinary items. No authoritative reference available. false 45 Contract profit changes 2 fwlt_ContractProfitChanges fwlt false credit duration The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or... false false false false false false false false false false false false 1 false true false false 500000 500 false false false 2 false true false false 2200000 2200 false false false 3 false true false false 8500000 8500 false false false 4 false true false false 1700000 1700 false false false xbrli:monetaryItemType monetary The current period impact on final estimated contract profit resulting from a change in estimated final contract revenues or costs relating to the revaluation of work performed on contracts in prior periods. No authoritative reference available. false 49 C&F Group [Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 14 USD true false false false fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 16 USD true false false false fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 17 USD true false false false fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_CFGroupMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 50 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 52 EBITDA 2 fwlt_SegmentReportingOperatingIncomeLoss fwlt false credit duration Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and... false false false false false false false false false false false terselabel false 1 false true false false -21617000 -21617 [1],[5] false false false 2 false true false false -22446000 -22446 [2],[5] false false false 3 false true false false -40153000 -40153 [3],[5] false false false 4 false true false false -46927000 -46927 [4],[5] false false false xbrli:monetaryItemType monetary Amount of income or loss for the reportable segment before depreciation and amortization, interest expense, income taxes, and extraordinary items. No authoritative reference available. false 63 Amount of provision from the regular revaluation of asbestos liability and related asset included in EBITDA in C&F Group 2 fwlt_NetAsbestosRelatedProvisionGain fwlt false debit duration Net (gain)/loss for charges on the revaluation of the asbestos liability and related asset. false false false false false false false false false false false verboselabel false 1 false true false false 2344000 2344 false false false 2 false true false false 1756000 1756 false false false 3 false true false false 1597000 1597 false false false 4 false true false false 3506000 3506 false false false xbrli:monetaryItemType monetary Net (gain)/loss for charges on the revaluation of the asbestos liability and related asset. No authoritative reference available. false 65 Power Generation[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 18 USD true false false false fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 19 USD true false false false fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 20 USD true false false false fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 21 USD true false false false fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerGenerationMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 66 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 80 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 145782000 145782 false false false 2 false true false false 261859000 261859 false false false 3 false true false false 300962000 300962 false false false 4 false true false false 561156000 561156 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 81 Oil Refining[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 22 USD true false false false fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 23 USD true false false false fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 24 USD true false false false fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 25 USD true false false false fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilRefiningMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 82 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 96 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 391860000 391860 false false false 2 false true false false 366879000 366879 false false false 3 false true false false 707698000 707698 false false false 4 false true false false 666994000 666994 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 97 Pharmaceutical[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 26 USD true false false false fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 27 USD true false false false fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 28 USD true false false false fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 29 USD true false false false fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PharmaceuticalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 98 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 112 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 11894000 11894 false false false 2 false true false false 19234000 19234 false false false 3 false true false false 24491000 24491 false false false 4 false true false false 34604000 34604 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 113 Oil and Gas[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 30 USD true false false false fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 31 USD true false false false fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 32 USD true false false false fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 33 USD true false false false fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OilAndGasMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 114 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 128 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 301574000 301574 false false false 2 false true false false 304541000 304541 false false false 3 false true false false 599196000 599196 false false false 4 false true false false 594407000 594407 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 129 Chemical/Petrochemical[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 34 USD true false false false fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 35 USD true false false false fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 36 USD true false false false fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 37 USD true false false false fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_ChemicalPetrochemicalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 130 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 144 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 118663000 118663 false false false 2 false true false false 320642000 320642 false false false 3 false true false false 250770000 250770 false false false 4 false true false false 653682000 653682 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 145 Power Plant Operation and Maintenance[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 38 USD true false false false fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 39 USD true false false false fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 40 USD true false false false fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 41 USD true false false false fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_PowerPlantOperationAndMaintenanceMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 146 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 160 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 26857000 26857 false false false 2 false true false false 27816000 27816 false false false 3 false true false false 51179000 51179 false false false 4 false true false false 51909000 51909 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 161 Environmental[Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 42 USD true false false false fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 43 USD true false false false fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 44 USD true false false false fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 45 USD true false false false fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_EnvironmentalMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 162 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 176 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 3477000 3477 false false false 2 false true false false 2886000 2886 false false false 3 false true false false 6601000 6601 false false false 4 false true false false 6682000 6682 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 177 Other, net of eliminations [Member] 0 na true na na No definition available. false true false false false false false false false false false http://fwc.com/role/disclosurebusinesssegmentsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 46 USD true false false false fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 47 USD true false false false fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 48 USD true false false false fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 49 USD true false false false fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi fwlt_OtherNetOfEliminationsMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 178 Operating revenues and operating performance by segment 2 us-gaap_SegmentReportingMeasurementDisclosuresAbstract us-gaap true na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 192 Total third-party revenues 2 us-gaap_ContractsRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false 5389000 5389 false false false 2 true true false false 4944000 4944 false false false 3 true true false false 10172000 10172 false false false 4 true true false false 3890000 3890 false false false xbrli:monetaryItemType monetary Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. No authoritative reference available. false 1 Includes in the fiscal quarter ended June 30, 2010: increased contract profit of $8,600 from the regular revaluation of final estimated contract profit*: $8,100 in our Global E&C Group and $500 in our Global Power Group; and a net provision of $2,344 in our C&F Group on the revaluation of our asbestos liability and related asset**. 2 Includes in the fiscal quarter ended June 30, 2009: increased contract profit of $20,200 from the regular revaluation of the final estimated contract profit*: $18,000 in our Global E&C Group and $2,200 in our Global Power Group; and a net provision of $1,756 in our C&F Group on the revaluation of our asbestos liability and related asset**. 3 Includes in the fiscal six months ended June 30, 2010: increased contract profit of $33,700 from the regular revaluation of final estimated contract profit*: $25,200 in our Global E&C Group and $8,500 in our Global Power Group; a $20,086 curtailment gain in our Global E&C Group on the closure of the U.K. pension plan for future defined benefit accrual; and a net provision of $1,597 in our C&F Group on the revaluation of our asbestos liability and related asset**. 4 Includes in the fiscal six months ended June 30, 2009: increased contract profit of $26,200 from the regular revaluation of final estimated contract profit*: $24,500 in our Global E&C Group and $1,700 in our Global Power Group; and a net provision of $3,506 in our C&F Group on the revaluation of our asbestos liability and related asset**. 5 Includes general corporate income and expense, our captive insurance operation and the elimination of transactions and balances related to intercompany interest. 4 53 false Thousands UnKnown UnKnown false true