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Share capital - Warrants (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Aug. 20, 2013
Aug. 18, 2013
Class of Warrant or Right [Line Items]        
Maximum percent of warrants reserved for issuance 4.00%tpre_MaximumPercentofWarrantsReservedforIssuance 4.00%tpre_MaximumPercentofWarrantsReservedforIssuance    
Maximum value of warrants reserved for issuance $ 1,000,000,000tpre_MaximumValueofWarrantsReservedforIssuance $ 1,000,000,000tpre_MaximumValueofWarrantsReservedforIssuance    
Exercise price (in dollars per share) 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights    
Authorized and issued (in shares) 4,651,163.000us-gaap_ClassOfWarrantOrRightOutstanding 4,651,163.000us-gaap_ClassOfWarrantOrRightOutstanding    
Aggregated fair value of warrants 17,374,000us-gaap_WarrantsAndRightsOutstanding 17,374,000us-gaap_WarrantsAndRightsOutstanding    
Warrants authorized and issued (in shares)     1,003,157tpre_ClassofWarrantorRightOutstandingRelatedtoPerformanceCondition 3,648,006tpre_ClassofWarrantorRightOutstandingRelatedtoPerformanceCondition
Fair value of founder and advisor warrants   3,700,000tpre_AdjustmentstoAdditionalPaidinCapitalFairValueofIssuedWarrantShareholdersEquity    
Term of warrants 10 years 10 years    
Founders        
Class of Warrant or Right [Line Items]        
Maximum percent of warrants reserved for issuance 3.50%tpre_MaximumPercentofWarrantsReservedforIssuance
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		 3.50%tpre_MaximumPercentofWarrantsReservedforIssuance
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		    
Exercise price (in dollars per share) 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		    
Authorized and issued (in shares) 4,069,768us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		 4,069,868us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		    
Aggregated fair value of warrants 15,203,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		 15,203,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_FoundersMember		    
Advisor        
Class of Warrant or Right [Line Items]        
Maximum percent of warrants reserved for issuance 0.50%tpre_MaximumPercentofWarrantsReservedforIssuance
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		 0.50%tpre_MaximumPercentofWarrantsReservedforIssuance
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		    
Exercise price (in dollars per share) 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		    
Authorized and issued (in shares) 581,395us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		 581,295us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		    
Aggregated fair value of warrants $ 2,171,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember		 $ 2,171,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_TitleOfIndividualAxis
= tpre_AdvisorMember