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Deposit contracts (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2013
Jun. 30, 2013
May 01, 2013
Oct. 01, 2012
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 02, 2013
Oct. 02, 2012
Deposit Contracts [Line Items]                  
Number of loss portfolio contracts   2tpre_NumberofLossPortfolioContracts              
Quarterly interest credit   0.625%tpre_DepositContractsLiabilitiesQuarterlyInterestCredit           0.625%tpre_DepositContractsLiabilitiesQuarterlyInterestCredit  
Consideration $ 14,200tpre_DepositContractsLiabilitiesAgreementConsideration $ 27,200tpre_DepositContractsLiabilitiesAgreementConsideration $ 25,000tpre_DepositContractsLiabilitiesAgreementConsideration $ 50,000tpre_DepositContractsLiabilitiesAgreementConsideration   $ 116,369tpre_DepositContractsLiabilitiesAgreementConsideration $ 50,000tpre_DepositContractsLiabilitiesAgreementConsideration    
Net investment expense allocation and fair value of embedded derivatives         3,996tpre_DepositContractsLiabilitiesNetInvestmentIncomeAllocationAccruedandFairValueofEmbeddedDerivatives 4,731tpre_DepositContractsLiabilitiesNetInvestmentIncomeAllocationAccruedandFairValueofEmbeddedDerivatives      
Net investment expense accrued           5,177tpre_DepositContractsLiabilitiesNetInvestmentIncomeAllocationAccrued 446tpre_DepositContractsLiabilitiesNetInvestmentIncomeAllocationAccrued    
Payments         350tpre_DepositContractsLiabilitiesPayments 600tpre_DepositContractsLiabilitiesPayments 0tpre_DepositContractsLiabilitiesPayments    
Deposit liabilities         142,990us-gaap_DepositContractsLiabilities 120,946us-gaap_DepositContractsLiabilities 50,446us-gaap_DepositContractsLiabilities    
Reinsurance Balance Received [Member]                  
Deposit Contracts [Line Items]                  
Consideration         6,132tpre_DepositContractsLiabilitiesAgreementConsideration
/ us-gaap_BalanceSheetLocationAxis
= tpre_ReinsuranceBalanceReceivedMember		 66,369tpre_DepositContractsLiabilitiesAgreementConsideration
/ us-gaap_BalanceSheetLocationAxis
= tpre_ReinsuranceBalanceReceivedMember		      
Reinsurance Balance Receivable [Member]                  
Deposit Contracts [Line Items]                  
Consideration         $ 12,266tpre_DepositContractsLiabilitiesAgreementConsideration
/ us-gaap_BalanceSheetLocationAxis
= tpre_ReinsuranceBalanceReceivableMember		 $ 0tpre_DepositContractsLiabilitiesAgreementConsideration
/ us-gaap_BalanceSheetLocationAxis
= tpre_ReinsuranceBalanceReceivableMember		      
Minimum                  
Deposit Contracts [Line Items]                  
Aggregate excess of loss agreement, crediting rate     3.00%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   2.50%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		       3.00%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Deposit Contracts, Liabilities, Variable Crediting Rate         6.10%tpre_DepositContractsLiabilitiesVariableCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Maximum                  
Deposit Contracts [Line Items]                  
Aggregate excess of loss agreement, crediting rate     6.50%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   3.00%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		       6.10%tpre_DepositContractsLiabilitiesCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Deposit Contracts, Liabilities, Variable Crediting Rate         6.50%tpre_DepositContractsLiabilitiesVariableCreditingRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember