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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment [Line Items] |  |
Equity investments trading | $ 322,098 us-gaap_TradingSecuritiesEquity | $ 254,776 us-gaap_TradingSecuritiesEquity
Financials |  |
Investment [Line Items] |  |
Equity investments trading | 222,190 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingFinancialsMember | 152,905 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingFinancialsMember
Communications and technology |  |
Investment [Line Items] |  |
Equity investments trading | 31,376 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingCommunicationsandTechnologyMember | 4,300 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingCommunicationsandTechnologyMember
Industrial, utilities and energy |  |
Investment [Line Items] |  |
Equity investments trading | 28,859 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingIndustrialUtilitiesandEnergyMember | 25,350 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingIndustrialUtilitiesandEnergyMember
Consumer |  |
Investment [Line Items] |  |
Equity investments trading | 19,522 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingConsumerMember | 44,115 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingConsumerMember
Healthcare |  |
Investment [Line Items] |  |
Equity investments trading | 16,582 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingHealthcareMember | 15,340 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingHealthcareMember
Basic materials |  |
Investment [Line Items] |  |
Equity investments trading | $ 3,569 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingBasicMaterialsMember | $ 12,766 us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingBasicMaterialsMember

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- Definition Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests. + 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 210.5-02.2) -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 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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