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Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |
Fair Value | $ 293,126 us-gaap_AlternativeInvestmentsFairValueDisclosure
Unfunded Commitments | 163,653 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Private equity partnerships |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |
Fair Value | 271,074 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember
Unfunded Commitments | 157,729 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember
Senior secured bank loan funds |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |
Fair Value | 19,679 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = rnr_SeniorSecuredBankLoanFundsMember
Unfunded Commitments | 5,924 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = rnr_SeniorSecuredBankLoanFundsMember
Hedge funds |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |
Fair Value | 2,373 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember
Unfunded Commitments | $ 0 us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember

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- Definition Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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