2.2.0.7 false CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) 0040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME true false In Thousands false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 5 Net income 3 us-gaap_ProfitLoss 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 134056000 134056 false false false 2 true true false false 153263000 153263 false false false 3 true true false false 260441000 260441 false false false 4 true true false false 340783000 340783 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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 7 Net unrealized appreciation of investments, net of tax: 4 us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract 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 8 Net unrealized holding losses of fixed maturities on which other-than-temporary impairments were taken 5 trh_OtherThanTemporaryImpairmentPortionRecognizedInOtherComprehensiveIncome trh false debit duration Represents the non-credit portion of other-than-temporary impairments taken on fixed maturity securities during the period. 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 true false false -6093000 -6093 false false false 3 false true false false -6713000 -6713 false false false 4 false true false false -6565000 -6565 false false false xbrli:monetaryItemType monetary Represents the non-credit portion of other-than-temporary impairments taken on fixed maturity securities during the period. No authoritative reference available. false 9 Net unrealized holding gains on all other securities 5 trh_OtherComprehensiveIncomeUnrealizedHoldingGainLossArisingDuringPeriodOnAllOtherSecurities trh false credit duration Net unrealized gains or losses on all securities other than the portion representing non-credit other-than-temporary... false false false false false false false false false false false terselabel false 1 false true false false 239672000 239672 false false false 2 false true false false 499309000 499309 false false false 3 false true false false 271086000 271086 false false false 4 false true false false 730002000 730002 false false false xbrli:monetaryItemType monetary Net unrealized gains or losses on all securities other than the portion representing non-credit other-than-temporary impairments on fixed maturity securities. No authoritative reference available. false 10 Reclassification adjustment for (gains) losses included in net income 5 trh_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndOtherThanTemporaryImpairmentIncludedInNetIncomeBeforeTax trh false debit duration Pre tax reclassification adjustment for gains or losses realized upon the sale of securities and on other than temporary... false false false false false false false false false false false terselabel false 1 false true false false -20320000 -20320 false false false 2 false true false false -12219000 -12219 false false false 3 false true false false -39690000 -39690 false false false 4 false true false false 71294000 71294 false false false xbrli:monetaryItemType monetary Pre tax reclassification adjustment for gains or losses realized upon the sale of securities and on other than temporary impairments. No authoritative reference available. false 11 Deferred income tax charge on above 5 us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesTax us-gaap true na duration No definition available. false false false false false false false false false false true negated false 1 false true false false -76773000 -76773 false false false 2 false true false false -168348000 -168348 false false false 3 false true false false -78639000 -78639 false false false 4 false true false false -278155000 -278155 false false false xbrli:monetaryItemType monetary Tax effect of the gross appreciation or the gross loss, net of reclassification adjustment, in the change in value of available for sale securities during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 25 false 12 Total net unrealized appreciation of investments, net of tax 5 us-gaap_OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 142579000 142579 false false false 2 false true false false 312649000 312649 false false false 3 false true false false 146044000 146044 false false false 4 false true false false 516576000 516576 false false false xbrli:monetaryItemType monetary Gross appreciation or the gross loss in value of the total unsold securities at the end of an accounting period, after tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 22, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b true 13 Net unrealized currency translation gain, net of tax: 4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentAbstract 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 14 Net unrealized currency translation gain 5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 96092000 96092 false false false 2 false true false false 50271000 50271 false false false 3 false true false false 154800000 154800 false false false 4 false true false false 29974000 29974 false false false xbrli:monetaryItemType monetary Pre-tax adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains (losses). Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph c Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b false 15 Deferred income tax charge on above 5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax us-gaap true na duration No definition available. false false false false false false false false false false true negated false 1 false true false false -33632000 -33632 false false false 2 false true false false -17595000 -17595 false false false 3 false true false false -54180000 -54180 false false false 4 false true false false -10491000 -10491 false false false xbrli:monetaryItemType monetary Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 25 false 16 Total net unrealized currency translation gain (loss), net of tax 5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 62460000 62460 false false false 2 false true false false 32676000 32676 false false false 3 false true false false 100620000 100620 false false false 4 false true false false 19483000 19483 false false false xbrli:monetaryItemType monetary Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 26 true 17 Other comprehensive income 4 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 205039000 205039 false false false 2 false true false false 345325000 345325 false false false 3 false true false false 246664000 246664 false false false 4 false true false false 536059000 536059 false false false xbrli:monetaryItemType monetary This element represents Other Comprehensive Income (Loss), Net of Tax, for the period. Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 22, 23, 24, 25 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 true 18 Comprehensive income 3 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false 339095000 339095 false false false 2 true true false false 498588000 498588 false false false 3 true true false false 507105000 507105 false false false 4 true true false false 876842000 876842 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a true 4 13 false Thousands UnKnown UnKnown false true