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Noncontrolling Interests (Schedule Of Noncontrolling Interest) (Details) (USD $)
3 Months Ended 12 Months Ended 0 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
Dec. 01, 2013
Noncontrolling Interest [Line Items]                        
Ownership interest with other equity investors, Amount $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures       $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures       $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                        
Net loss attributable to noncontrolling interest 44,215,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 30,477,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 36,078,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 42,768,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 54,191,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 44,331,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 14,015,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 38,607,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 153,538,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 151,144,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 148,040,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest  
Angus                        
Noncontrolling Interest [Line Items]                        
Equity method investee, noncash contribution                       2,300,000rnr_NonCashTransferToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
Ownership % 40.40%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
      42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
38.80%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
    40.40%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
  42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
Goodwill                       1,700,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnr_AngusMember
Angus Fund                        
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                        
Balance, Beginning       0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
      3,991,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
3,991,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
   
Adjustment in ownership interest                 0us-gaap_MinorityInterestPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= rnr_AngusFundMember
(3,709,000)us-gaap_MinorityInterestPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= rnr_AngusFundMember
   
Net loss attributable to noncontrolling interest                 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
(54,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
   
Dividends on common shares                 0us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= rnr_AngusFundMember
(228,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= rnr_AngusFundMember
   
Balance, Ending 0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
      0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
      0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
   
Angus Fund | RRV U.S. Holdings LLC                        
Noncontrolling Interest [Line Items]                        
Ownership interest with other equity investors, Amount           55,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= rnr_AngusFundMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnr_RRVU.S.HoldingsLLCMember
           
Redeemable noncontrolling interest, ownership percentage           1.10%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= rnr_AngusFundMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnr_RRVU.S.HoldingsLLCMember
           
Angus Fund | RenTech U.S. Holdings LLC                        
Noncontrolling Interest [Line Items]                        
Ownership interest with other equity investors, Amount           $ 2,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= rnr_AngusFundMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnr_RenTechU.S.HoldingsLLCMember
           
Redeemable noncontrolling interest, ownership percentage           35.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= rnr_AngusFundMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnr_RenTechU.S.HoldingsLLCMember