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Investments (Schedule of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 135,655 us-gaap_InterestAndDividendIncomeOperating | $ 219,593 us-gaap_InterestAndDividendIncomeOperating | $ 177,531 us-gaap_InterestAndDividendIncomeOperating
Investment expenses |  |  |  |  |  |  |  |  | (11,339)us-gaap_InvestmentIncomeInvestmentExpense | (11,565)us-gaap_InvestmentIncomeInvestmentExpense | (11,806)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income | 25,886 us-gaap_NetInvestmentIncome | 24,941 us-gaap_NetInvestmentIncome | 34,541 us-gaap_NetInvestmentIncome | 38,948 us-gaap_NetInvestmentIncome | 78,732 us-gaap_NetInvestmentIncome | 59,931 us-gaap_NetInvestmentIncome | 26,163 us-gaap_NetInvestmentIncome | 43,202 us-gaap_NetInvestmentIncome | 124,316 us-gaap_NetInvestmentIncome | 208,028 us-gaap_NetInvestmentIncome | 165,725 us-gaap_NetInvestmentIncome
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 100,855 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 95,907 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 103,330 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Short term investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 944 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 1,698 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember | 1,007 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Equity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 3,450 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 2,295 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | 1,086 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Other investments, Hedge funds and private equity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 18,867 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember | 45,810 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember | 36,635 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember
Other investments, Other |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 11,144 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember | 73,692 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember | 35,196 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 395 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember | $ 191 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember | $ 277 us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember

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- 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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