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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
	Mar. 31, 2015	Mar. 31, 2014
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains on investments	$ 41,749us-gaap_GainLossOnInvestments	$ 14,927us-gaap_GainLossOnInvestments
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains	21,532rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	13,467rnr_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	16,661rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	7,903rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net unrealized gains (losses) on investments trading	25,972us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	27,882us-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	$ 7,481us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember	$ (79)us-gaap_TradingSecuritiesRealizedGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember

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This item represents the gross profit realized on the sale of debt securities categorized as trading or available for sale.

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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.

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No definition available.

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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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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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.

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-Publisher FASB

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