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Investments (Schedule of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 42,809us-gaap_InterestAndDividendIncomeOperating	$ 41,782us-gaap_InterestAndDividendIncomeOperating
Investment expenses	(3,102)us-gaap_InvestmentIncomeInvestmentExpense	(2,834)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income	39,707us-gaap_NetInvestmentIncome	38,948us-gaap_NetInvestmentIncome
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	25,939us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	23,860us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	197us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	190us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	2,604us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	796us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Other investments, Hedge funds and private equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	10,413us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember	12,317us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember
Other investments, Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	3,508us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember	4,528us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 148us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	$ 91us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember

X

- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.1-5)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1, 2 , 3, 4, 5

-Article 9

+ Details

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- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 2

-Article 7

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