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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ (13,851)us-gaap_DerivativeGainLossOnDerivativeNet | $ 27,601 us-gaap_DerivativeGainLossOnDerivativeNet | $ 9,687 us-gaap_DerivativeGainLossOnDerivativeNet
Net realized and unrealized gains on investments | Interest Rate Futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (32,713)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 29,695 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | (1,746)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net realized and unrealized gains on investments | Credit Default Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 328 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 1,363 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 1,074 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net realized and unrealized gains on investments | Weather Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 1,454 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | (1,331)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1 | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnInvestmentsMember1
Net foreign exchange gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 4,457 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | 889 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | 13,804 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember
Net foreign exchange gains | Foreign Currency Forward Contracts, Investment Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ 12,623 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | $ (3,015)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | $ (3,445)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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