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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
Investment [Line Items]
Equity investments trading	$ 322,098us-gaap_TradingSecuritiesEquity	$ 254,776us-gaap_TradingSecuritiesEquity
Financials
Investment [Line Items]
Equity investments trading	222,190us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingFinancialsMember	152,905us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingFinancialsMember
Communications and technology
Investment [Line Items]
Equity investments trading	31,376us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingCommunicationsandTechnologyMember	4,300us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingCommunicationsandTechnologyMember
Industrial, utilities and energy
Investment [Line Items]
Equity investments trading	28,859us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingIndustrialUtilitiesandEnergyMember	25,350us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingIndustrialUtilitiesandEnergyMember
Consumer
Investment [Line Items]
Equity investments trading	19,522us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingConsumerMember	44,115us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingConsumerMember
Healthcare
Investment [Line Items]
Equity investments trading	16,582us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingHealthcareMember	15,340us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingHealthcareMember
Basic materials
Investment [Line Items]
Equity investments trading	$ 3,569us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingBasicMaterialsMember	$ 12,766us-gaap_TradingSecuritiesEquity / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_EquityInvestmentsTradingBasicMaterialsMember

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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

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