2.4.0.81130 - Disclosure - Pension and Other Postretirement Healthcare Benefits - Summary of Benefit Obligations and Plan Assets Associated With Benefit Plans (Parenthetical) (Detail)truefalseIn Millions, unless otherwise specifiedfalse1false USDfalsefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_569018x736758http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_569018x736758http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseThe Netherlands Retirement Planus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_NetherlandMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0The Netherlands Retirement Plan2true 3trox_DefinedBenefitPlansDisclosuresEffectOfSubsidyOnNetPeriodicPostretirementBenefitCostLineItemstrox_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Defined Benefit Plans Disclosures Effect Of Subsidy On Net Periodic Postretirement Benefit Cost [Line Items]3false 4us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse40000004USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. false2Estimated future employer contribution4false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_569018x659880http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseU. S. qualified retirement plan [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_USRetirementPlansMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0U. S. qualified retirement plan [Member]5true 3trox_DefinedBenefitPlansDisclosuresEffectOfSubsidyOnNetPeriodicPostretirementBenefitCostLineItemstrox_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Defined Benefit Plans Disclosures Effect Of Subsidy On Net Periodic Postretirement Benefit Cost [Line Items]6false 4us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse60000006USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Estimated future employer contribution7false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$eol_PE864322--13S-4-0005_STD_0_20121231_0_569018x726933http://www.sec.gov/CIK0001530804instant2012-12-31T00:00:000001-01-01T00:00:00falsefalseU.S.postretirement healthcare plan [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrlditrox_UsRetireeHealthcarePlansMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0U.S.postretirement healthcare plan [Member]8true 3trox_DefinedBenefitPlansDisclosuresEffectOfSubsidyOnNetPeriodicPostretirementBenefitCostLineItemstrox_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Defined Benefit Plans Disclosures Effect Of Subsidy On Net Periodic Postretirement Benefit Cost [Line Items]9false 4us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10000001USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -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. false2Estimated future employer contributionfalsePension and Other Postretirement Healthcare Benefits - Summary of Benefit Obligations and Plan Assets Associated With Benefit Plans (Parenthetical) (Detail) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://imetrix.edgar-online.com/taxonomy/role/DisclosurePensionAndOtherPostretirementHealthcareBenefitsSummaryOfBenefitObligationsAndPlanAssetsAssociatedWithBenefitPlansParenthetical19