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Loss and loss adjustment expense reserves - Schedule of activity in the reserve for losses and loss adjustment expenses (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Gross reserves for loss and loss adjustment expenses, beginning of year | $ 134,331 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | $ 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | $ 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | $ 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross
Less: loss and loss adjustment expenses recoverable, beginning of year | 9,277 us-gaap_ReinsuranceRecoverables | 0 us-gaap_ReinsuranceRecoverables | 0 us-gaap_ReinsuranceRecoverables | 0 us-gaap_ReinsuranceRecoverables
Net reserves for loss and loss adjustment expenses, beginning of year | 125,054 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Current year | 149,325 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear | 107,279 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear | 144,509 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear | 80,306 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear
Prior years' | 1,458 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears | (3,600)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears | (4,697)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears | 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears
Total incurred loss and loss adjustment expenses | 150,783 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims | 103,679 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims | 139,812 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims | 80,306 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims
Net loss and loss adjustment expenses paid in respect of losses occurring in: |  |  |  |
Current year | (41,538)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear | (14,951)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear | (27,528)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear | (13,035)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear
Prior years' | (48,398)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears | (18,576)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears | (54,501)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears | 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears
Total net paid losses | (89,936)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid | (33,527)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid | (82,029)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid | (13,035)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid
Net reserve for loss and loss adjustment expenses, end of year | (185,901)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | (137,423)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 125,054 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Plus: loss and loss adjustment expenses recoverable, end of year | 1,412 us-gaap_ReinsuranceRecoverables | 6,284 us-gaap_ReinsuranceRecoverables | 9,277 us-gaap_ReinsuranceRecoverables | 0 us-gaap_ReinsuranceRecoverables
Gross reserve for loss and loss adjustment expenses, end of year | 187,313 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | 143,707 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | 134,331 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross | 67,271 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseGross
Favorable Loss Experience on Several Contracts |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years' | 900 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears / us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAdjustmentOfOpeningBalanceAxis = tpre_FavorableLossExperienceonSeveralContractsMember |  | (1,300)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears / us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAdjustmentOfOpeningBalanceAxis = tpre_FavorableLossExperienceonSeveralContractsMember |
Premium Estimate Decreases Related to One Crop Contract |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years' | 600 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears / us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAdjustmentOfOpeningBalanceAxis = tpre_PremiumEstimateDecreasesRelatedtoOneCropContractMember |  | (3,400)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears / us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAdjustmentOfOpeningBalanceAxis = tpre_PremiumEstimateDecreasesRelatedtoOneCropContractMember |
Decrease in Reserve [Member] |  |  |  |
Increase (decrease) in net loss and loss adjustment expenses incurred in respect of losses occurring in: |  |  |  |
Prior years' |  |  | $ (3,600)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears / us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAdjustmentOfOpeningBalanceAxis = tpre_DecreaseinReserveMember |

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- Definition Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments made in the reporting period to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments made in the reporting period to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The estimated cost of settling claims under the terms of the underlying insurance policies and assumed and ceded insurance contracts as of the balance sheet date, including an estimate for claims which have been incurred but not reported and the actual and estimated costs of settling claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b + Details
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- Definition Total provision in the period for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of provision in the period for claims incurred in the reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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