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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 5,982,843us-gaap_TradingSecuritiesDebt	$ 4,756,685us-gaap_TradingSecuritiesDebt
U.S. treasuries
Investment [Line Items]
Fixed maturity investments trading, at fair value	1,535,746us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember	1,671,471us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Agencies
Investment [Line Items]
Fixed maturity investments trading, at fair value	152,272us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AgencySecuritiesMember	96,208us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AgencySecuritiesMember
Municipals
Investment [Line Items]
Fixed maturity investments trading, at fair value	1,220,206us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	0us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Non-U.S. government (Sovereign Debt)
Investment [Line Items]
Fixed maturity investments trading, at fair value	329,626us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember	280,651us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government-backed corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	151,446us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember	146,467us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Corporate
Investment [Line Items]
Fixed maturity investments trading, at fair value	1,603,024us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	1,610,442us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	339,279us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember	312,333us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Non-agency mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	257,114us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember	241,590us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Commercial mortgage-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	353,944us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember	373,117us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Asset-backed
Investment [Line Items]
Fixed maturity investments trading, at fair value	$ 40,186us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember	$ 24,406us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember

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Amount of investments in debt securities classified as trading.

+ References

Reference 1: 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 2: 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 3: 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 4: 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 5: 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)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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