2.2.0.25truefalse40305 - Disclosure - Investments (Narrative) (Details)truefalseIn Thousands, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Duration_1_1_2011_To_3_31_2011http://www.sec.gov/CIK0001130385duration2011-01-01T00:00:002011-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_3_31_2010http://www.sec.gov/CIK0001130385duration2010-01-01T00:00:002010-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false0fwlt_EquityInNetEarningsOfUnconsolidatedAffiliatesfwltfalsecreditdurationThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1249300012493falsetruefalsefalsefalse2truefalsefalse62890006289falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.No authoritative reference available.falsefalseEquity in the net earnings of partially owned affiliates3false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsetruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Centro Energia Ferrara and Centro Energia Teverola [Member] 3/31/2011 As_Of_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_CentroEnergiaFerraraAndCentroEnergiaTeverolaMemberhttp://www.sec.gov/CIK0001130385instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseCentro Energia Ferrara and Centro Energia Teverola [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_CentroEnergiaFerraraAndCentroEnergiaTeverolaMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseCentro Energia Ferrara and Centro Energia Teverola [Member]4false0us-gaap_EquityMethodInvestmentOwnershipPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.41650.4165falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) falsefalseInvestment in unconsolidated affiliates5false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse4falsefalsetruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Waste-to-Energy Project in Italy [Member] 3/31/2011 As_Of_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_WasteToEnergyProjectInItalyMemberhttp://www.sec.gov/CIK0001130385instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseWaste-to-Energy Project in Italy [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_WasteToEnergyProjectInItalyMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseWaste-to-Energy Project in Italy [Member]6false0us-gaap_EquityMethodInvestmentOwnershipPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.390.39falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) falsefalseInvestment in unconsolidated affiliates7false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse5falsefalsetruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Wind Farm Project in Italy [Member] 3/31/2011 As_Of_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_WindFarmProjectInItalyMemberhttp://www.sec.gov/CIK0001130385instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseWind Farm Project in Italy [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_WindFarmProjectInItalyMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseWind Farm Project in Italy [Member]8false0us-gaap_EquityMethodInvestmentOwnershipPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.50.5falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) falsefalseInvestment in unconsolidated affiliates9false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse6falsefalsetruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Refinery/Power Generation Project in Chile [Member] 3/31/2011 As_Of_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_RefineryPowerGenerationProjectInChileMemberhttp://www.sec.gov/CIK0001130385instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseRefinery/Power Generation Project in Chile [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_RefineryPowerGenerationProjectInChileMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseRefinery/Power Generation Project in Chile [Member]10false0us-gaap_EquityMethodInvestmentOwnershipPercentageus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.850.85falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) falsefalseInvestment in unconsolidated affiliates11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Chile [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_ChileMemberhttp://www.sec.gov/CIK0001130385duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseChile [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_ChileMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Chile [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_ChileMemberhttp://www.sec.gov/CIK0001130385duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseChile [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_ChileMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseChile [Member]12false0fwlt_EquityInNetEarningsOfUnconsolidatedAffiliatesfwltfalsecreditdurationThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse98870009887falsefalsefalsefalsefalse2truefalsefalse28310002831falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.No authoritative reference available.falsefalseEquity in the net earnings of partially owned affiliates13false0fwlt_UnconsolidatedAffiliateInsuranceRecoveryAssessmentReceivableCurrentfwltfalsedebitinstantReceivable related to the remaining balance under an unconsolidated affiliate's insurance recovery assessment for a claim for...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse5350000053500falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReceivable related to the remaining balance under an unconsolidated affiliate's insurance recovery assessment for a claim for reimbursement due to a loss suffered by the unconsolidated affiliate that is covered under their insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.No authoritative reference available.falsefalseUnconsolidated affiliate insurance recovery assessment receivable, current14false0fwlt_DebtServiceLetterOfCreditRelatedPartyDisclosurefwltfalsecreditinstantDescribes certain required disclosures for debt service reserve letter of credit to cover debt payments of equity investee.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1000000010000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDescribes certain required disclosures for debt service reserve letter of credit to cover debt payments of equity investee.No authoritative reference available.falsefalseDebt service letter of credit15false0fwlt_GuaranteeForObligationRelatedPartyfwltfalsecreditinstantDescribes certain required disclosures for those guarantees that are issued to benefit entities meeting the definition of a...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2000000020000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDescribes certain required disclosures for those guarantees that are issued to benefit entities meeting the definition of a related party.No authoritative reference available.falsefalseGuarantee for obligation under Chile based project operation and maintenance agreement16false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse9falsefalsetruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Waste-to-energy facility in Camden [Member] 1/1/2011 - 3/31/2011 Duration_1_1_2011_To_3_31_2011_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_WasteToEnergyFacilityInCamdenMemberhttp://www.sec.gov/CIK0001130385duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseWaste-to-energy facility in Camden [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_WasteToEnergyFacilityInCamdenMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0OthernaNo definition available.No authoritative reference available.falsefalseWaste-to-energy facility in Camden [Member]17false0us-gaap_VariableInterestEntityOwnershipPercentageus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse11falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepurePercentage of the VIE's voting interest owned by the registrant. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company.No authoritative reference available.falsefalseEquity interest in VIE18false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse10falsefalseUSDtruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Centro Energia Teverola [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_CentroEnergiaTeverolaMemberhttp://www.sec.gov/CIK0001130385duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseCentro Energia Teverola [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_CentroEnergiaTeverolaMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCentro Energia Teverola [Member]19false0fwlt_EquityInNetEarningsOfUnconsolidatedAffiliatesfwltfalsecreditdurationThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse428000428falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.No authoritative reference available.falsefalseEquity in the net earnings of partially owned affiliates20false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://fwc.com/role/disclosureinvestmentsnarrativedetails1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse11falsefalseUSDtruefalse{us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis} : Centro Energia Ferrara [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_fwlt_CentroEnergiaFerraraMemberhttp://www.sec.gov/CIK0001130385duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseCentro Energia Ferrara [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_CentroEnergiaFerraraMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseCentro Energia Ferrara [Member]21false0fwlt_EquityInNetEarningsOfUnconsolidatedAffiliatesfwltfalsecreditdurationThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse511000511falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis amount represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.No authoritative reference available.falsefalseEquity in the net earnings of partially owned affiliates220Investments (Narrative) (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruetrue