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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains on investments | $ 30,475 us-gaap_GainLossOnInvestments | $ (31,097)us-gaap_GainLossOnInvestments | $ 27,128 us-gaap_GainLossOnInvestments | $ 14,927 us-gaap_GainLossOnInvestments | $ 61,864 us-gaap_GainLossOnInvestments | $ 28,472 us-gaap_GainLossOnInvestments | $ (69,529)us-gaap_GainLossOnInvestments | $ 14,269 us-gaap_GainLossOnInvestments | $ 41,433 us-gaap_GainLossOnInvestments | $ 35,076 us-gaap_GainLossOnInvestments | $ 163,121 us-gaap_GainLossOnInvestments
Total other-than-temporary impairments |  |  |  |  |  |  |  |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities | (395)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Portion recognized in other comprehensive income (loss), before taxes |  |  |  |  |  |  |  |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities | 52 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Net other-than-temporary impairments recognized in earnings |  |  |  |  |  |  |  |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities | (343)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 45,568 rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 72,492 rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 97,787 rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Gross realized losses |  |  |  |  |  |  |  |  | (14,868)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | (50,206)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | (16,705)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net realized gains on fixed maturity investments |  |  |  |  |  |  |  |  | 30,700 rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 22,286 rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 81,082 rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 19,680 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | (87,827)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 75,279 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains on investments-related derivatives |  |  |  |  |  |  |  |  | (30,931)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | 31,058 rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | (866)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 11,076 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | 42,909 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | 7,626 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember
Net realized gains on equity investments trading |  |  |  |  |  |  |  |  | $ 10,908 us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | $ 26,650 us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | $ 0 us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio. + References No definition available. + Details
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- Definition 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 (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (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 (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 (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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