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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b true 7 Decrease in net unearned premiums 2 orh_IncreaseDecreaseUnearnedInsurancePremiums orh false debit duration Category of deferred revenue by arrangement wherein premiums written are initially booked as unearned and are generally... false false false false false false false false false false true negated false 1 false true false false 48891000 48891 false false false 2 false true false false 20664000 20664 false false false 3 false true false false 32799000 32799 false false false 4 false true false false 11703000 11703 false false false xbrli:monetaryItemType monetary Category of deferred revenue by arrangement wherein premiums written are initially booked as unearned and are generally recognized as revenue over the expected term of the short-duration insurance contract. A short-duration contract provides insurance protection for a fixed period of short duration and enables the insurer to cancel the contract or to adjust the provisions of the contract at the end of any contract period, such as adjusting the amount of premiums charged or coverage provided. No authoritative reference available. false 8 Net premiums earned 2 us-gaap_PremiumsEarnedNet us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 470495000 470495 false false false 2 false true false false 480471000 480471 false false false 3 false true false false 927590000 927590 false false false 4 false true false false 950489000 950489 false false false xbrli:monetaryItemType monetary Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b true 9 Net investment income 2 us-gaap_NetInvestmentIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 79794000 79794 false false false 2 false true false false 92758000 92758 false false false 3 false true false false 163324000 163324 false false false 4 false true false false 160086000 160086 false false false xbrli:monetaryItemType monetary The income earned from investments in securities and property, equipment and other capital assets. It includes rent from property and equipment, dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It does not include realized gains and losses on investments. 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No authoritative reference available. false 13 Total net realized investment gains (losses) 3 us-gaap_GainLossOnInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 109642000 109642 false false false 2 false true false false 55171000 55171 false false false 3 false true false false 162567000 162567 false false false 4 false true false false -43627000 -43627 false false false xbrli:monetaryItemType monetary This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or loss which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments of the subject investments. 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For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 true 15 EXPENSES 1 us-gaap_CostOfRevenueAbstract us-gaap true na duration No definition available. false false false false false true false false false false false 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 16 Losses and loss adjustment expenses 2 us-gaap_IncurredClaimsPropertyCasualtyAndLiability us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 321042000 321042 false false false 2 false true false false 321903000 321903 false false false 3 false true false false 696940000 696940 false false false 4 false true false false 639494000 639494 false false false xbrli:monetaryItemType monetary Provision for benefits, claims and claims settlement expenses incurred during the period for property and casualty insurance net of the effects of contracts assumed and ceded. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 false 17 Acquisition costs 2 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 89833000 89833 false false false 2 false true false false 97844000 97844 false false false 3 false true false false 178873000 178873 false false false 4 false true false false 190848000 190848 false false false xbrli:monetaryItemType monetary Amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 22, 23, 24, 25, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16, 18 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph c Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 95-1 -Paragraph 19, 20, 21, 22, 23 false 18 Other underwriting expenses 2 us-gaap_OtherUnderwritingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 45696000 45696 false false false 2 false true false false 44022000 44022 false false false 3 false true false false 96703000 96703 false false false 4 false true false false 87127000 87127 false false false xbrli:monetaryItemType monetary Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 27 false 19 Other expense (income), net 2 us-gaap_OtherExpenses us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false -18699000 -18699 false false false 2 false true false false -15453000 -15453 false false false 3 false true false false 13240000 13240 false false false 4 false true false false -11251000 -11251 false false false xbrli:monetaryItemType monetary This element represents a sum total of expenses not separately reflected on the income statement for the period. No authoritative reference available. false 20 Interest expense 2 us-gaap_InterestExpense us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 7511000 7511 false false false 2 false true false false 7818000 7818 false false false 3 false true false false 14996000 14996 false false false 4 false true false false 15903000 15903 false false false xbrli:monetaryItemType monetary The cost of borrowed funds accounted for as interest that was charged against earnings during the period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 true 22 Income before income taxes 1 orh_IncomeFromOperationsBeforeIncomeTaxExpense orh false credit duration Income before income taxes false false false false false false false false false false false totallabel false 1 false true false false 214548000 214548 false false false 2 false true false false 172266000 172266 false false false 3 false true false false 252729000 252729 false false false 4 false true false false 144827000 144827 false false false xbrli:monetaryItemType monetary Income before income taxes No authoritative reference available. true 23 Federal and foreign income tax provision (benefit): 1 us-gaap_CurrentIncomeTaxExpenseBenefitAbstract us-gaap true na duration No definition available. false false false false false true false false false false false 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 24 Current 2 us-gaap_CurrentIncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 39638000 39638 false false false 2 false true false false 30202000 30202 false false false 3 false true false false 77435000 77435 false false false 4 false true false false 64824000 64824 false false false xbrli:monetaryItemType monetary The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable income (loss) from continuing operations. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 39 COMPREHENSIVE INCOME (LOSS) 1 us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract us-gaap true na duration No definition available. false false false false false true false false false false false 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 40 Net income 2 us-gaap_NetIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 150398000 150398 false false false 2 false true false false 122978000 122978 false false false 3 false true false false 187143000 187143 false false false 4 false true false false 117467000 117467 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 41 Other comprehensive (loss) income, net of tax 2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false -109682000 -109682 false false false 2 false true false false 359818000 359818 false false false 3 false true false false -9051000 -9051 false false false 4 false true false false 275058000 275058 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 false 42 Comprehensive income 2 us-gaap_ComprehensiveIncomeNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 true true false false 40716000 40716 false false false 2 true true false false 482796000 482796 false false false 3 true true false false 178092000 178092 false false false 4 true true false false 392525000 392525 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 reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes 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 30 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 AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 8, 9, 10, 11, 12, 13, 14 false 4 40 false Thousands NoRounding NoRounding false true