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Discontinued Operations (Income (Loss) from Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  | $ 2,517 rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  |  |  | (96)rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax
Other (loss) income |  |  |  |  |  |  |  |  |  |  | (18,055)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
Net realized and unrealized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  |  |  | 3 rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments
Total revenues |  |  |  |  |  |  |  |  |  |  | (15,631)us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operational expenses |  |  |  |  |  |  |  |  |  |  | 586 rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating
Corporate expenses |  |  |  |  |  |  |  |  |  |  | 236 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense
Total expenses |  |  |  |  |  |  |  |  |  |  | 822 rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses
(Loss) income before taxes |  |  |  |  |  |  |  |  |  |  | (16,453)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax expense |  |  |  |  |  |  |  |  |  |  | (23)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
(Loss) income from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (9,779)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2,427 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 9,774 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 2,422 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (16,476)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
REAL |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 1,150 rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | 2,517 rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  |  | 849 rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (96)rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Other (loss) income |  |  |  |  |  |  |  |  |  | 701 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (20,785)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Net realized and unrealized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  |  | (18)rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | 3 rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Total revenues |  |  |  |  |  |  |  |  |  | 2,682 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (18,361)us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operational expenses |  |  |  |  |  |  |  |  |  | 89 rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | 150 rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Corporate expenses |  |  |  |  |  |  |  |  |  | 104 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | 236 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Total expenses |  |  |  |  |  |  |  |  |  | 193 rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | 386 rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
(Loss) income before taxes |  |  |  |  |  |  |  |  |  | 2,489 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (18,747)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Income tax expense |  |  |  |  |  |  |  |  |  | (67)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (16)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
(Loss) income from discontinued operations |  |  |  |  |  |  |  |  |  | 2,422 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember | (18,763)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
U.S.-based insurance operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  | 0 rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  |  |  | 0 rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Other (loss) income |  |  |  |  |  |  |  |  |  |  | 2,730 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Net realized and unrealized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  |  |  | 0 rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Total revenues |  |  |  |  |  |  |  |  |  |  | 2,730 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operational expenses |  |  |  |  |  |  |  |  |  |  | 436 rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Corporate expenses |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Total expenses |  |  |  |  |  |  |  |  |  |  | 436 rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
(Loss) income before taxes |  |  |  |  |  |  |  |  |  |  | 2,294 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Income tax expense |  |  |  |  |  |  |  |  |  |  | (7)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
(Loss) income from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 2,287 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember

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- Definition Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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