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v2.4.1.9

Related Party Transactions and Major Customers (Details) (USD $) | 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
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 132,780,000 us-gaap_PremiumsWrittenGross | $ 200,992,000 us-gaap_PremiumsWrittenGross | $ 511,540,000 us-gaap_PremiumsWrittenGross | $ 705,260,000 us-gaap_PremiumsWrittenGross | $ 84,122,000 us-gaap_PremiumsWrittenGross | $ 182,649,000 us-gaap_PremiumsWrittenGross | $ 703,223,000 us-gaap_PremiumsWrittenGross | $ 635,418,000 us-gaap_PremiumsWrittenGross | $ 1,550,572,000 us-gaap_PremiumsWrittenGross | $ 1,605,412,000 us-gaap_PremiumsWrittenGross | $ 1,551,591,000 us-gaap_PremiumsWrittenGross
Gross premiums earned |  |  |  |  |  |  |  |  | 1,450,047,000 us-gaap_AssumedPremiumsEarned | 1,482,511,000 us-gaap_AssumedPremiumsEarned | 1,465,701,000 us-gaap_AssumedPremiumsEarned
Acquisition expenses | 39,749,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 37,550,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 33,477,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 33,700,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 31,026,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 37,699,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 31,767,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 25,009,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 144,476,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 125,501,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 113,542,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | (30,634,000)us-gaap_ReinsuranceCostsAndRecoveriesNet | (13,852,000)us-gaap_ReinsuranceCostsAndRecoveriesNet | (78,280,000)us-gaap_ReinsuranceCostsAndRecoveriesNet
Reserve for claims and claim expenses | 1,412,510,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |  | 1,563,730,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |  | 1,412,510,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 1,563,730,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 1,879,377,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Distributions received |  |  |  |  |  |  |  |  | 10,300,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 9,900,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 9,900,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions
Equity interest investment in related party | 143,632,000 us-gaap_EquityMethodInvestmentAggregateCost |  |  |  | 139,382,000 us-gaap_EquityMethodInvestmentAggregateCost |  |  |  | 143,632,000 us-gaap_EquityMethodInvestmentAggregateCost | 139,382,000 us-gaap_EquityMethodInvestmentAggregateCost |
Catastrophe Reinsurance and Specialty Reinsurance | Gross Premiums Written |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 89.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 88.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 84.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember
Number of significant customers |  |  |  |  |  |  |  |  | 3 rnr_NumberOfSignificantCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember |  |
Catastrophe Reinsurance and Specialty Reinsurance | Gross Premiums Written | AON Benfield |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 56.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_AonBenfieldMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 48.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_AonBenfieldMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 51.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_AonBenfieldMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember
Catastrophe Reinsurance and Specialty Reinsurance | Gross Premiums Written | Marsh Inc. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 21.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_MarshIncMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 22.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_MarshIncMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 21.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_MarshIncMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember
Catastrophe Reinsurance and Specialty Reinsurance | Gross Premiums Written | Willis Group |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of gross premiums received |  |  |  |  |  |  |  |  | 11.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_WillisGroupMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 16.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_WillisGroupMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember | 11.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_GrossPremiumsWrittenMember / us-gaap_MajorCustomersAxis = rnr_WillisGroupMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember
Tower Hill |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 40,000,000 us-gaap_PremiumsWrittenGross / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 46,700,000 us-gaap_PremiumsWrittenGross / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 41,100,000 us-gaap_PremiumsWrittenGross / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember
Gross premiums earned |  |  |  |  |  |  |  |  | 41,900,000 us-gaap_AssumedPremiumsEarned / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 44,900,000 us-gaap_AssumedPremiumsEarned / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 36,100,000 us-gaap_AssumedPremiumsEarned / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember
Acquisition expenses |  |  |  |  |  |  |  |  | 4,700,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 5,300,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 3,900,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember
Related party receivables | 18,300,000 us-gaap_AccountsReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |  |  |  | 20,200,000 us-gaap_AccountsReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |  |  |  | 18,300,000 us-gaap_AccountsReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 20,200,000 us-gaap_AccountsReceivableRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |
Net reinsurance costs and recoveries |  |  |  |  |  |  |  |  | 3,600,000 us-gaap_ReinsuranceCostsAndRecoveriesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 4,100,000 us-gaap_ReinsuranceCostsAndRecoveriesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 4,000,000 us-gaap_ReinsuranceCostsAndRecoveriesNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember
Reserve for claims and claim expenses | 40,300,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |  |  |  | 37,100,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |  |  |  | 40,300,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 37,100,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |
Distributions received |  |  |  |  |  |  |  |  | 10,000,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember | 9,800,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TowerHillMember |
Angus |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest investment in related party | 10,500,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember |  |  |  |  |  |  |  | 10,500,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember |  |
Ownership % | 40.40%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember |  |  |  |  |  |  |  | 40.40%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember |  |
Related party income |  |  |  |  |  |  |  |  | 0 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember | 5,000,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember | 7,900,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_AngusMember
Top Layer Re |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  |  |  |  |  |  |  | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember
Management fees revenue |  |  |  |  |  |  |  |  | $ 2,800,000 us-gaap_ManagementFeesRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember | $ 3,800,000 us-gaap_ManagementFeesRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember | $ 4,100,000 us-gaap_ManagementFeesRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rnr_TopLayerReMember

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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rnr_AngusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rnr_TopLayerReMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rnr_TowerHillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_CatastropheReinsuranceandSpecialtyReinsuranceSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |