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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
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Mar. 31, 2015 | Mar. 31, 2014
Gain (Loss) on Investments [Line Items] |  |
Net realized and unrealized gains on investments | $ 41,749 us-gaap_GainLossOnInvestments | $ 14,927 us-gaap_GainLossOnInvestments
Fixed maturity investments |  |
Gain (Loss) on Investments [Line Items] |  |
Gross realized gains | 21,532 rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 13,467 rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Gross realized losses | (4,871)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | (5,564)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net realized gains on fixed maturity investments | 16,661 rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 7,903 rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net unrealized gains (losses) on investments trading | 25,972 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember | 27,882 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Derivatives |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized and unrealized losses on investments-related derivatives | (4,208)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember | (10,899)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Equity investments |  |
Gain (Loss) on Investments [Line Items] |  |
Net unrealized gains (losses) on investments trading | (4,157)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | (9,880)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember
Net realized gains (losses) on equity investments trading | $ 7,481 us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember | $ (79)us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember

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- Definition This item represents the gross profit realized on the sale of debt securities categorized as trading or available for sale. + References No definition available. + Details
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- Definition This item represents the net profit realized on the sale of debt securities categorized as trading or available for sale. + References No definition available. + Details
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- Definition This item represents the gross losses realized on the sale of debt securities categorized as trading or available for sale. + References No definition available. + Details
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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 This item represents the gain (loss) realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 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)) -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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: 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)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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