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[Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseInternational Commingled Fixed Income Fundsus-gaap_PlanNameAxisxbrldihttp://xbrl.org/2006/xbrlditrox_CommingledFundsDebtSecuritiesMemberus-gaap_PlanNameAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$31false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20111231_0_566507x608495_567857x573123_569018x682431http://www.sec.gov/CIK0001530804instant2011-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pensionus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsPensionPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseSignificant Other Observable Inputs (Level 2) [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseInternational Commingled Fixed Income Fundsus-gaap_PlanNameAxisxbrldihttp://xbrl.org/2006/xbrlditrox_CommingledFundsDebtSecuritiesMemberus-gaap_PlanNameAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$32false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_566507x603425_567857x573123_569018x682431http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pensionus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsPensionPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseSignificant Other Observable Inputs (Level 2) [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommingled Cash Equivalents Fundus-gaap_PlanNameAxisxbrldihttp://xbrl.org/2006/xbrlditrox_CommingledFundMemberus-gaap_PlanNameAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$33false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20111231_0_566507x603425_567857x573123_569018x682431http://www.sec.gov/CIK0001530804instant2011-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pensionus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsPensionPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseSignificant Other Observable Inputs (Level 2) [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommingled Cash Equivalents Fundus-gaap_PlanNameAxisxbrldihttp://xbrl.org/2006/xbrlditrox_CommingledFundMemberus-gaap_PlanNameAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$34false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20111231_0_566507x807015_567857x573123_569018x682431http://www.sec.gov/CIK0001530804instant2011-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pensionus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsPensionPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseSignificant Other Observable Inputs (Level 2) [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset backed [Member]us-gaap_PlanNameAxisxbrldihttp://xbrl.org/2006/xbrlditrox_TotalAssetBackedMemberus-gaap_PlanNameAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$35false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_569018x682431_573086x734659http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseU.S. Pensionus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsPensionPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseCommingled Equity 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[Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$44false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_567857x567924_569018x861406http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseNetherlands Planus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_NetherlandsPlanMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberfalsefalseU.S. Level 3 Assetsus-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$45false 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usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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