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v2.4.1.9

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 | $ 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  | $ 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  | $ 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to noncontrolling interest | 44,215,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 30,477,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 36,078,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 42,768,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 54,191,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 44,331,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 14,015,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 38,607,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 153,538,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 151,144,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 148,040,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Angus |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee, noncash contribution |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 rnr_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 |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_AngusMember
Angus Fund |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, Beginning |  |  |  | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  | 3,991,000 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember | 3,991,000 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |
Adjustment in ownership interest |  |  |  |  |  |  |  |  | 0 us-gaap_MinorityInterestPeriodIncreaseDecrease / dei_LegalEntityAxis = rnr_AngusFundMember | (3,709,000)us-gaap_MinorityInterestPeriodIncreaseDecrease / dei_LegalEntityAxis = rnr_AngusFundMember |  |
Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_AngusFundMember | (54,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |
Dividends on common shares |  |  |  |  |  |  |  |  | 0 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = rnr_AngusFundMember | (228,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = rnr_AngusFundMember |  |
Balance, Ending | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember | 0 us-gaap_MinorityInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |
Angus Fund | RRV U.S. Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest with other equity investors, Amount |  |  |  |  |  | 55,000 us-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 |  |  |  |  |  | $ 2,000,000 us-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 |  |  |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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