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Schedule IV - Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                              
Net premiums earned $ 108,948us-gaap_PremiumsEarnedNet $ 58,510us-gaap_PremiumsEarnedNet $ 66,329us-gaap_PremiumsEarnedNet $ 62,287us-gaap_PremiumsEarnedNet $ 33,541us-gaap_PremiumsEarnedNet $ 33,485us-gaap_PremiumsEarnedNet $ 34,318us-gaap_PremiumsEarnedNet $ 14,841us-gaap_PremiumsEarnedNet $ 13,837us-gaap_PremiumsEarnedNet $ 0us-gaap_PremiumsEarnedNet $ 260,960us-gaap_PremiumsEarnedNet $ 162,157us-gaap_PremiumsEarnedNet $ 220,667us-gaap_PremiumsEarnedNet $ 96,481us-gaap_PremiumsEarnedNet $ 0us-gaap_PremiumsEarnedNet
Property and Casualty Reinsurance                              
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                              
Direct gross premiums written                   0us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
    0us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
0us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
 
Ceded to other companies                   0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
    9,975us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
 
Assumed from other companies                   0us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
    401,937us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
190,374us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
 
Net premiums earned                   $ 0us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
    $ 391,962us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
$ 190,374us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
 
Percentage of amount assumed to net                         98.00%us-gaap_PremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember
100.00%us-gaap_PremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= tpre_PropertyandCasualtyReinsuranceMember