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Investments - Narrative (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value Disclosures [Abstract] |  |  |  |
Securities valued based on dealer quotes or other quoted market prices for similar securities | $ 445,400,000 us-gaap_SecurityOwnedNotReadilyMarketableQuotedValue | $ 483,200,000 us-gaap_SecurityOwnedNotReadilyMarketableQuotedValue |  | $ 248,400,000 us-gaap_SecurityOwnedNotReadilyMarketableQuotedValue
Percent of securities valued based on dealer quotes or other quoted market prices for similar securities | 25.40%tpre_SecurityOwnedNotReadilyMarketableQuotedPricePercent | 33.10%tpre_SecurityOwnedNotReadilyMarketableQuotedPricePercent |  | 26.50%tpre_SecurityOwnedNotReadilyMarketableQuotedPricePercent
Securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities | 1,500,000 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased | 41,000,000 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased |  | 68,800,000 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
Percent of securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities | 2.60%tpre_SecurityOwnedandSoldNotYetPurchasedNotReadilyMarketableQuotedPricePercent | 73.10%tpre_SecurityOwnedandSoldNotYetPurchasedNotReadilyMarketableQuotedPricePercent |  | 39.00%tpre_SecurityOwnedandSoldNotYetPurchasedNotReadilyMarketableQuotedPricePercent
Private common equity securities | 2,800,000 tpre_FinancialInstrumentsOwnedPrivateSecuritiesatFairValue | 3,300,000 tpre_FinancialInstrumentsOwnedPrivateSecuritiesatFairValue |  | 2,800,000 tpre_FinancialInstrumentsOwnedPrivateSecuritiesatFairValue
Securities fair valued by using information obtained from the Company's Investment Manager representing less than 1% of total investments in securities and commodities | 1.00%tpre_PrivateSecuritiesPercentofInvestmentinSecuritiesandCommodities | 1.00%tpre_PrivateSecuritiesPercentofInvestmentinSecuritiesandCommodities |  | 1.00%tpre_PrivateSecuritiesPercentofInvestmentinSecuritiesandCommodities
Asset transfers from level 1 to level 2 | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Asset transfers from level 2 to level 1 | 86.6 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Liability transfers from level 1 to level 2 | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount
Liability transfers from level 2 to level 1 | 0 us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount | 0 us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount
Total unrealized gain (loss) related to fair value assets using significant unobservable inputs (Level 3 | $ 400,000 tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss | $ 1,000,000 tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss | $ 1,800,000 tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss | $ (700,000)tpre_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetsUnrealizedGainLoss

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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