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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Comprehensive income
Net income	$ 213,100us-gaap_ProfitLoss	$ 199,366us-gaap_ProfitLoss
Change in net unrealized gains on investments	(74)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(168)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income	213,026us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	199,198us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net income attributable to noncontrolling interests	(39,662)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable	(42,768)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
Comprehensive income attributable to noncontrolling interests	(39,662)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(42,768)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to RenaissanceRe	173,364us-gaap_ComprehensiveIncomeNetOfTax	156,430us-gaap_ComprehensiveIncomeNetOfTax
Disclosure regarding net unrealized gains
Total net realized and unrealized holding (gains) losses on investments and net other-than-temporary impairments	(23)rnr_OtherComprehensiveIncomeLossAdjustmentForNetRealizedandUnrealizedHoldingGainsLossesonInvestmentsandNetOtherThanTemporaryImpairmentsPortionAttributableToParent	(168)rnr_OtherComprehensiveIncomeLossAdjustmentForNetRealizedandUnrealizedHoldingGainsLossesonInvestmentsandNetOtherThanTemporaryImpairmentsPortionAttributableToParent
Net realized gains on fixed maturity investments available for sale	(51)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	0us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
Change in net unrealized gains on investments	$ (74)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	$ (168)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent

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Other Comprehensive Income (Loss) Adjustment For Net Realized and Unrealized Holding Gains (Losses) on Investments and Net Other Than Temporary Impairments, Portion Attributable To Parent

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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