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Taxation (Income Tax Reconciliation) (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
Income Tax [Line Items]
Expected income tax benefit									$ 4,725us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 9,930us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 8,889us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Change in valuation allowance									(5,554)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(8,574)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(6,212)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other									221us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(3,048)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(4,090)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax (expense) benefit	$ (401)us-gaap_IncomeTaxExpenseBenefit	$ (245)us-gaap_IncomeTaxExpenseBenefit	$ 204us-gaap_IncomeTaxExpenseBenefit	$ (166)us-gaap_IncomeTaxExpenseBenefit	$ (1,336)us-gaap_IncomeTaxExpenseBenefit	$ (223)us-gaap_IncomeTaxExpenseBenefit	$ (11)us-gaap_IncomeTaxExpenseBenefit	$ (122)us-gaap_IncomeTaxExpenseBenefit	$ (608)us-gaap_IncomeTaxExpenseBenefit	$ (1,692)us-gaap_IncomeTaxExpenseBenefit	$ (1,413)us-gaap_IncomeTaxExpenseBenefit
Bermuda | Domestic Country
Income Tax [Line Items]
Statutory income tax rate									0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_StatementGeographicalAxis = country_BM
U.S. | Internal Revenue Service (IRS)
Income Tax [Line Items]
Foreign statutory income tax rate									35.00%rnr_EffectiveIncomeTaxRateReconciliationAtForeignStatutoryIncomeTaxRatePercent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_StatementGeographicalAxis = country_US
Ireland | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									12.50%rnr_EffectiveIncomeTaxRateReconciliationAtForeignStatutoryIncomeTaxRatePercent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IE
United Kingdom | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									21.50%rnr_EffectiveIncomeTaxRateReconciliationAtForeignStatutoryIncomeTaxRatePercent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_GB
Singapore | Foreign
Income Tax [Line Items]
Foreign statutory income tax rate									17.00%rnr_EffectiveIncomeTaxRateReconciliationAtForeignStatutoryIncomeTaxRatePercent / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_SG

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Effective Income Tax Rate Reconciliation, at Foreign Statutory Income Tax Rate, Percent

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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