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Non-controlling interests - Narrative (Details) (USD $)
12 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2012
Jun. 15, 2012
Noncontrolling Interest [Line Items]          
Ownership percentage         85.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Noncontrolling interest, increase from contributed capital $ 25,300,000tpre_NoncontrollingInterestIncreasefromContributedCapital        
Third Point Hellenic Recovery US Feeder Fund, L.P.          
Noncontrolling Interest [Line Items]          
Estimated fair value of investment 5,300,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
6,800,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
     
Ownership percentage 2.00%tpre_OwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
2.00%tpre_OwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
     
Committed capital, amount called 4,300,000tpre_CommittedCapitalAmountCalled
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
1,600,000tpre_CommittedCapitalAmountCalled
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
     
Committed Capital, Amount Distributed   700,000tpre_CommittedCapitalAmountDistributed
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= tpre_ThirdPointHellenicRecoveryUSFeederFundL.P.Member
     
Third Point Reinsurance Opportunities Fund Ltd          
Noncontrolling Interest [Line Items]          
Estimated fair value of investment 54,800,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
58,600,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
  22,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
 
Ownership percentage 53.00%tpre_OwnershipPercentage
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
49.90%tpre_OwnershipPercentage
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
     
Ownership percentage of nonparticipating shares 100.00%tpre_OwnershipPercentageofNonparticipatingSharesbyParent
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
100.00%tpre_OwnershipPercentageofNonparticipatingSharesbyParent
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
     
Ownership percentage of participating shares 100.00%tpre_OwnershipPercentageofParticipatingSharesbyParent
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
100.00%tpre_OwnershipPercentageofParticipatingSharesbyParent
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
     
Committed capital, amount called 53,000,000tpre_CommittedCapitalAmountCalled
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceOpportunitiesFundLtdMember
       
Third Point Reinsurance Company Limited          
Noncontrolling Interest [Line Items]          
Committed capital, amount called 28,000,000tpre_CommittedCapitalAmountCalled
/ dei_LegalEntityAxis
= tpre_ThirdPointReinsuranceCompanyLtdMember
       
Hiscox | Catastrophe Fund Manager          
Noncontrolling Interest [Line Items]          
Ownership percentage 15.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_CounterpartyNameAxis
= tpre_ThirdPointReinsuranceInvestmentManagementLtd.Member
/ dei_LegalEntityAxis
= tpre_HiscoxMember
15.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_CounterpartyNameAxis
= tpre_ThirdPointReinsuranceInvestmentManagementLtd.Member
/ dei_LegalEntityAxis
= tpre_HiscoxMember
     
Joint Venture - Third Point Advisors LLC share          
Noncontrolling Interest [Line Items]          
Distributions $ 35,100,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= tpre_ThirdPointAdvisorsLLCMember
$ 51,000,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= tpre_ThirdPointAdvisorsLLCMember
$ 35,100,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= tpre_ThirdPointAdvisorsLLCMember
$ 0us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= tpre_ThirdPointAdvisorsLLCMember