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Schedule I. Summary of Investments Other Than Investments in Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Market Value | $ 6,743,750 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue |
Amount at which shown in the Balance Sheet | 6,743,750 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount |
Short-term investments | 1,013,222 us-gaap_OtherShortTermInvestments | 1,044,779 us-gaap_OtherShortTermInvestments
Equity investments trading | 322,098 us-gaap_TradingSecuritiesEquity | 254,776 us-gaap_TradingSecuritiesEquity
Other investments | 504,147 us-gaap_OtherInvestments | 573,264 us-gaap_OtherInvestments
Investments in other ventures, under equity method | 120,713 us-gaap_EquityMethodInvestments | 105,616 us-gaap_EquityMethodInvestments
U.S. treasuries |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 1,672,441 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember |
Market Value | 1,671,471 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember |
Amount at which shown in the Balance Sheet | 1,671,471 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_USTreasurySecuritiesMember |
Agencies |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 96,271 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AgencySecuritiesMember |
Market Value | 96,208 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AgencySecuritiesMember |
Amount at which shown in the Balance Sheet | 96,208 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AgencySecuritiesMember |
Non-U.S. government (Sovereign Debt) |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 287,856 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtMember |
Market Value | 280,651 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtMember |
Amount at which shown in the Balance Sheet | 280,651 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_ForeignGovernmentDebtMember |
Non-U.S. government-backed corporate |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 146,691 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember |
Market Value | 146,467 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember |
Amount at which shown in the Balance Sheet | 146,467 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember |
Corporate |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 1,611,172 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember |
Market Value | 1,610,442 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember |
Amount at which shown in the Balance Sheet | 1,610,442 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CorporateDebtSecuritiesMember |
Agency mortgage-backed |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 315,911 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Market Value | 316,620 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Amount at which shown in the Balance Sheet | 316,620 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Non-agency mortgage-backed |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 237,891 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Market Value | 253,050 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Amount at which shown in the Balance Sheet | 253,050 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Commercial mortgage-backed |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 377,792 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Market Value | 381,051 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Amount at which shown in the Balance Sheet | 381,051 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Asset-backed |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 27,360 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember |
Market Value | 27,610 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember |
Amount at which shown in the Balance Sheet | 27,610 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed maturity investments |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Amortized Cost | 4,773,385 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember |
Market Value | 4,783,570 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember |
Amount at which shown in the Balance Sheet | $ 4,783,570 us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_FixedMaturitiesMember |

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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