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Net investment income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 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
Net Investment Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains on investments and investment derivatives | $ (62,448)tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives | $ 7,404 tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives |  |  |  |  |  | $ (67,407)tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives | $ 31,709 tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives | $ 78,950 tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives | $ 113,422 tpre_ChangeinNetUnrealizedGainsLossesonInvestmentsandInvestmentDerivatives |
Net realized gains on investments and investment derivatives | 53,378 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives | 63,778 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives |  |  |  |  |  | 184,686 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives | 176,673 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives | 236,333 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives | 55,632 tpre_NetRealizedGainsLossesonInvestmentAndDerivatives |
Net gain (loss) on foreign currencies | 13,125 us-gaap_ForeignCurrencyTransactionGainLossRealized | (1,353)us-gaap_ForeignCurrencyTransactionGainLossRealized |  |  |  |  |  | 4,851 us-gaap_ForeignCurrencyTransactionGainLossRealized | 4,364 us-gaap_ForeignCurrencyTransactionGainLossRealized | 21,106 us-gaap_ForeignCurrencyTransactionGainLossRealized | (219)us-gaap_ForeignCurrencyTransactionGainLossRealized |
Dividend and interest income, net of withholding taxes |  |  |  |  |  |  |  |  |  | 14,233 tpre_DividendandInterestIncomeNetofWithholdingTaxes | 25,284 tpre_DividendandInterestIncomeNetofWithholdingTaxes |
Dividend and investment income | 6,628 us-gaap_InvestmentIncomeInterestAndDividend | 4,287 us-gaap_InvestmentIncomeInterestAndDividend |  |  |  |  |  | 22,405 us-gaap_InvestmentIncomeInterestAndDividend | 15,587 us-gaap_InvestmentIncomeInterestAndDividend |  |  |
Dividends paid on securities sold, not yet purchased | 0 tpre_DividendsPaidonSecuritiesSoldNotYetPurchased | (171)tpre_DividendsPaidonSecuritiesSoldNotYetPurchased |  |  |  |  |  | (34)tpre_DividendsPaidonSecuritiesSoldNotYetPurchased | (607)tpre_DividendsPaidonSecuritiesSoldNotYetPurchased | (722)tpre_DividendsPaidonSecuritiesSoldNotYetPurchased | (1,629)tpre_DividendsPaidonSecuritiesSoldNotYetPurchased |
Management and performance fees | (8,440)tpre_ManagementandPerformanceFees | (19,558)tpre_ManagementandPerformanceFees |  |  |  |  |  | (46,630)tpre_ManagementandPerformanceFees | (57,750)tpre_ManagementandPerformanceFees | (87,333)tpre_ManagementandPerformanceFees | (50,211)tpre_ManagementandPerformanceFees |
Other expenses | (1,573)tpre_InvestmentIncomeOtherInvestmentExpense | (1,860)tpre_InvestmentIncomeOtherInvestmentExpense |  |  |  |  |  | (6,743)tpre_InvestmentIncomeOtherInvestmentExpense | (4,383)tpre_InvestmentIncomeOtherInvestmentExpense | (8,863)tpre_InvestmentIncomeOtherInvestmentExpense | (5,411)tpre_InvestmentIncomeOtherInvestmentExpense |
Net investment income on investments managed by Third Point LLC | 670 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager | 52,527 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager |  |  |  |  |  | 91,128 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager | 165,593 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager | 253,704 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager | 136,868 tpre_NetInvestmentIncomeLossonInvestmentsManagedbyInvestmentManager |
Deposit liabilities and reinsurance contracts investment expense | 27 tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation | 28 tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation |  |  |  |  |  | 84 tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation | 44 tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation | (4,922)tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation | (446)tpre_DepositLiabilitiesandReinsuranceContractsInvestmentIncomeAllocation |
Investment income on cash collateral held by the Catastrophe Reinsurer |  |  |  |  |  |  |  |  |  | 86 tpre_InvestmentIncomeOther | 0 tpre_InvestmentIncomeOther |
Investment Income, Net Gain (Loss) on Bond | 75 tpre_InvestmentIncomeNetGainLossonBond | 0 tpre_InvestmentIncomeNetGainLossonBond |  |  |  |  |  | 80 tpre_InvestmentIncomeNetGainLossonBond | 0 tpre_InvestmentIncomeNetGainLossonBond |  |  |
Net gain on reinsurance contract derivatives written by the Catastrophe Reinsurer | 780 tpre_NetUnrealizedGainonReinsuranceContractDerivatives | 2,062 tpre_NetUnrealizedGainonReinsuranceContractDerivatives |  |  |  |  |  | 780 tpre_NetUnrealizedGainonReinsuranceContractDerivatives | 3,167 tpre_NetUnrealizedGainonReinsuranceContractDerivatives | 4,335 tpre_NetUnrealizedGainonReinsuranceContractDerivatives | 0 tpre_NetUnrealizedGainonReinsuranceContractDerivatives |
Net investment income | 1,552 tpre_InvestmentIncome | 54,617 tpre_InvestmentIncome | 72,511 tpre_InvestmentIncome | 47,686 tpre_InvestmentIncome | (17,623)tpre_InvestmentIncome | 33,848 tpre_InvestmentIncome | 0 tpre_InvestmentIncome | 92,072 tpre_InvestmentIncome | 168,804 tpre_InvestmentIncome | 253,203 tpre_InvestmentIncome | 136,422 tpre_InvestmentIncome | 0 tpre_InvestmentIncome
Net investment gains on equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | 6,282 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember | 60,042 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember |  |  |  |  |  | 56,927 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember | 167,364 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember | 243,449 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember | 96,210 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_EquitySecuritiesMember |
Net investment gains on debt securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | (5,435)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember | 14,950 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember |  |  |  |  |  | 81,540 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember | 57,549 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember | 69,194 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember | 65,040 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DebtSecuritiesMember |
Net investment gains (losses) on other investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | (25,807)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | (4,595)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember |  |  |  |  |  | (30,787)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | (1,517)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | (5,045)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember | 7,386 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember |
Net investment gains on derivatives |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | 18,446 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | 751 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember |  |  |  |  |  | 10,412 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | 19,143 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | 29,257 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | 5,793 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember |
Net investment gains (losses) on securities sold, not yet purchased |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | 4,861 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember | 5,857 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember |  |  |  |  |  | 20,245 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember | (16,017)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember | (5,974)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember | 17,076 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_SecuritiesSoldNotYetPurchasedMember |
Net investment income (loss) on cash |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | 15,095 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember | (2,906)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember |  |  |  |  |  | 5,921 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember | 2,243 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember | 17,961 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember | (1,230)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_CashMember |
Net investment gains on securities purchased under and agreement to resell |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | (2,381)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember | 1,207 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember |  |  |  |  |  | (2,592)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember | 1,228 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember | 1,863 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember | 562 tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_SecuritiesPurchasedUnderanAgreementToSellMember |
Management and performance fees |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | (8,440)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember | (19,558)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember |  |  |  |  |  | (46,630)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember | (57,750)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember | (87,333)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember | (50,211)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_ManagementandPerformanceFeesMember |
Other investment expenses |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income | (1,069)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember | (1,131)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember |  |  |  |  |  | (2,964)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember | (3,439)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember | (5,247)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember | (3,758)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherExpenseMember |
Deposit liabilities and reinsurance contracts investment expense |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net investment income |  |  |  |  |  |  |  |  |  | $ (4,922)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpenseMember | $ (446)tpre_IncreaseDecreaseinInvestmentIncome / us-gaap_FairValueByAssetClassAxis = tpre_DepositLiabilitiesandReinsuranceContractsInvestmentExpenseMember |

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