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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 310,544 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | $ 369,338 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total unrealized gains (losses) |  |
Included in net investment income | 4,988 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome | 18,650 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome
Total realized gains (losses) |  |
Included in other income | 1,316 rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome |
Total foreign exchange gains (losses) | (2,492)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses | (27)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses
Purchases | 86,159 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases | 15,001 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Settlements | (18,946)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements | (24,353)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Balance at end of the period | 381,569 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | 378,609 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Net investment income |  |
Total realized gains (losses) |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 4,988 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | 18,650 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Fixed maturity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 15,660 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 27,580 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Total unrealized gains (losses) |  |
Included in net investment income | (186)rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 9,558 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Total realized gains (losses) |  |
Included in other income | 0 rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember |
Total foreign exchange gains (losses) | 0 rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 0 rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Purchases | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Balance at end of the period | 15,474 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember | 37,138 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Fixed maturity investments | Net investment income |  |
Total realized gains (losses) |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | (186)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | 9,558 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Other Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 303,818 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 344,248 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Total unrealized gains (losses) |  |
Included in net investment income | 5,014 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 7,876 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Total realized gains (losses) |  |
Included in other income | 0 rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember |
Total foreign exchange gains (losses) | (2,498)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 6 rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Purchases | 5,738 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 15,001 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Settlements | (18,946)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | (24,353)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Balance at end of the period | 293,126 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 342,778 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Other Investments | Net investment income |  |
Total realized gains (losses) |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | 5,014 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | 7,876 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Other Assets and Liabilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | (8,934)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | (2,490)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Total unrealized gains (losses) |  |
Included in net investment income | 160 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | 1,216 rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Total realized gains (losses) |  |
Included in other income | 1,316 rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember |
Total foreign exchange gains (losses) | 6 rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | (33)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Purchases | 80,421 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Balance at end of the period | 72,969 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember | (1,307)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Other Assets and Liabilities | Net investment income |  |
Total realized gains (losses) |  |
Change in unrealized gains for the period included in earnings for assets held at the end of the period | $ 160 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | $ 1,216 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember

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- Definition This item represents the amount of the total foreign exchange gains or losses for the period which are included in the statement of income in net foreign exchange gains or losses. Such foreign exchange gains or losses relate to those assets or liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income. The fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total realized gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. The fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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