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Share-based compensation - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 10 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2011
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Nov. 04, 2013
Nov. 06, 2013
Aug. 20, 2013
Aug. 18, 2013
Jul. 15, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses $ 2,481,000us-gaap_AllocatedShareBasedCompensationExpense $ 4,143,000us-gaap_AllocatedShareBasedCompensationExpense $ 0us-gaap_AllocatedShareBasedCompensationExpense $ 6,979,000us-gaap_AllocatedShareBasedCompensationExpense $ 7,611,000us-gaap_AllocatedShareBasedCompensationExpense $ 9,800,000us-gaap_AllocatedShareBasedCompensationExpense $ 6,408,000us-gaap_AllocatedShareBasedCompensationExpense          
Unamortized share compensation expense 18,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized     18,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   23,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized            
Unamortized share compensation expense, period of recognition       1 year 8 months 12 days   2 years            
Options outstanding (in shares) 11,269,911.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 11,269,911.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   10,981,075.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 10,956,838.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber          
Fair value assumptions                        
Estimated share price (in dollars per share) $ 15.05us-gaap_SharePrice $ 10.89us-gaap_SharePrice   $ 15.05us-gaap_SharePrice $ 10.89us-gaap_SharePrice              
Volatility assumption       23.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 22.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate              
Risk free interest rate       2.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate              
Expected life       6 years 6 months 6 years 6 months              
Dividend yield       0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate              
Remaining contractual life       7 years 4 months 24 days 6 years 6 months              
Aggregate intrinsic value of options outstanding 29,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue     29,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue   61,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 5,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue          
Aggregate intrinsic value of options exercisable 10,100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1     10,100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1   17,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 500,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1          
Cliff Vest [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period           2 years            
Cliff Vest [Member] | Minimum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period             3 years          
Cliff Vest [Member] | Maximum                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period             5 years          
General and administrative expense                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses 2,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
4,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
  7,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
7,600,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
9,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
6,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
         
Employee [Member]                        
Fair value assumptions                        
Restricted shares issued           5,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= tpre_EmployeeMember
641,800us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= tpre_EmployeeMember
         
Non-Employee Directors [Member]                        
Fair value assumptions                        
Restricted shares issued           32,856us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= tpre_NonEmployeeDirectorsMember
0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_TitleOfIndividualAxis
= tpre_NonEmployeeDirectorsMember
         
Performance shares - conditions met                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses           2,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
           
Performance shares - conditions met | General and administrative expense                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses           2,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
           
Performance shares - conditions met | Management                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Conditions Met                   2,357,633tpre_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsPerformanceConditionsMet
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
8,572,594tpre_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsPerformanceConditionsMet
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
 
Options outstanding had met the performance condition (in shares)                   2,357,633tpre_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsPerformnceConditionsMet
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
8,572,594tpre_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsPerformnceConditionsMet
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
 
Management and director options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses 1,700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3,700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  5,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
6,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
8,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
4,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Options outstanding (in shares) 11,269,911.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
    11,269,911.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  10,981,075.000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
           
Fair value assumptions                        
Estimated share price (in dollars per share)           $ 10.89us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.00us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Volatility assumption           21.95%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
31.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Risk free interest rate           1.23%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Expected life           6 years 6 months 10 years          
Dividend yield           0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Remaining contractual life           8 years 0 months 22 days 9 years          
Management and director options | Management                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service condition met on each of first five anniversary dates following grant date       20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
  20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
           
Award vesting period       5 years   5 years            
Management and director options | Director                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Award vesting period       5 years   5 years            
Management and director options | Director | Previous Vesting on Five Anniversary Dates [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service condition met on each of first five anniversary dates following grant date               20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= tpre_PreviousVestingonFiveAnniversaryDatesMember
       
Management and director options | Director | Fully Vested on November 6th, 2013 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service condition met on each of first five anniversary dates following grant date                 60.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= tpre_FullyVestedonNovember6th2013Member
     
Management and director options | Director | Forfeited on November 6, 2013 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Service condition met on each of first five anniversary dates following grant date                 40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= tpre_ForfeitedonNovember62013Member
     
Restricted share awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share compensation expenses $ 800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
  $ 1,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 1,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 1,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 1,600,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Award vesting period       3 years   2 years            
Restricted share awards | Director                        
Fair value assumptions                        
Restricted shares issued 40,070us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
  40,070us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
             
Restricted share awards | Employee [Member]                        
Fair value assumptions                        
Restricted shares issued       9,614us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= tpre_EmployeeMember
5,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= tpre_EmployeeMember
             
Omnibus plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares authorized (in shares)                       21,627,906us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= tpre_OmnibusPlanMember
Number of shares available for future issuance (in shares) 10,215,455us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= tpre_OmnibusPlanMember
    10,215,455us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= tpre_OmnibusPlanMember
  10,613,975us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= tpre_OmnibusPlanMember