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Financial instruments with off-balance sheet risk or concentrations of credit risk (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Guarantor Obligations [Line Items] |  |  |
Asset | $ 37,260,000 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 39,045,000 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 25,628,000 us-gaap_DerivativeFairValueOfDerivativeAsset
Liability | 12,346,000 us-gaap_DerivativeFairValueOfDerivativeLiability | 8,819,000 us-gaap_DerivativeFairValueOfDerivativeLiability | 12,992,000 us-gaap_DerivativeFairValueOfDerivativeLiability
Credit spread |  |  | 0.44%tpre_CreditDerivativeCreditSpread
Written Credit Derivatives |  |  |
Guarantor Obligations [Line Items] |  |  |
Credit Derivative, Collateral |  | 1,600,000 tpre_CreditDerivativeCollateral / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Derivative, Maximum Payout | 875,600,000 tpre_DerivativeMaximumPayout / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 689,500,000 tpre_DerivativeMaximumPayout / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Derivative, Fair Value, Net | (1,345,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 809,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
0-5 years | 0 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 9,882,000 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
5 years or Greater Expiring Through 2046 | 7,755,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 550,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Total Written Credit Default Swaps | 7,755,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 10,432,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Asset | 158,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 1,157,000 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Liability | 1,503,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 348,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Net Asset/(Liability) | (1,345,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 809,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Written Credit Derivatives | Single name (0 - 250) |  |  |
Guarantor Obligations [Line Items] |  |  |
Derivative, Fair Value, Net | (1,503,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | (104,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
0-5 years | 0 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 368,000 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
5 years or Greater Expiring Through 2046 | 5,437,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 0 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Total Written Credit Default Swaps | 5,437,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 368,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Asset | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Liability | 1,503,000 us-gaap_DerivativeFairValueOfDerivativeLiability / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 104,000 us-gaap_DerivativeFairValueOfDerivativeLiability / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Net Asset/(Liability) | (1,503,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | (104,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Written Credit Derivatives | Single name (251-500) |  |  |
Guarantor Obligations [Line Items] |  |  |
Derivative, Fair Value, Net | 158,000 us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 1,136,000 us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
0-5 years | 0 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 9,514,000 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
5 years or Greater Expiring Through 2046 | 2,318,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 0 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Total Written Credit Default Swaps | 2,318,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 9,514,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Asset | 158,000 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 1,136,000 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Liability | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiability / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Net Asset/(Liability) | 158,000 us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 1,136,000 us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_SingleNameTwoMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Written Credit Derivatives | Index (0-250) |  |  |
Guarantor Obligations [Line Items] |  |  |
Derivative, Fair Value, Net |  | (223,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
0-5 years |  | 0 tpre_CreditDerivativeMaximumExposureUndiscountedThroughYearFive / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
5 years or Greater Expiring Through 2046 |  | 550,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 400,000 tpre_CreditDerivativeMaximumExposureUndiscountedAfterYearFive / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember
Total Written Credit Default Swaps |  | 550,000 us-gaap_CreditDerivativeMaximumExposureUndiscounted / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Asset |  | 21,000 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember | 200,000 us-gaap_DerivativeFairValueOfDerivativeAsset / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember
Liability |  | 244,000 us-gaap_DerivativeFairValueOfDerivativeLiability / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Net Asset/(Liability) |  | (223,000)us-gaap_DerivativeFairValueOfDerivativeNet / tpre_CreditSpreadAxis = tpre_IndexOneMember / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember |
Written Credit Derivatives | Estimate of Fair Value Measurement |  |  |
Guarantor Obligations [Line Items] |  |  |
Derivative, Fair Value, Net | 8,000,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,600,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Net Asset/(Liability) | 8,000,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 2,600,000 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = tpre_WrittenCreditDerivativesMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Credit risk exposure |  |  |
Guarantor Obligations [Line Items] |  |  |
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | $ 25,300,000 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_DerivativeInstrumentRiskAxis = tpre_CreditRiskExposureMember | $ 19,000,000 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_DerivativeInstrumentRiskAxis = tpre_CreditRiskExposureMember | $ 17,000,000 us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure / us-gaap_DerivativeInstrumentRiskAxis = tpre_CreditRiskExposureMember

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- Definition Credit Derivative, Collateral + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit Derivative, Credit Spread + References No definition available. + Details
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Balance Type: | na
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- Definition Credit Derivative, Maximum Exposure, Undiscounted, After Year Five + References No definition available. + Details
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Namespace Prefix: | tpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Credit Derivative , Maximum Exposure, Undiscounted, Through Year Five + References No definition available. + Details
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Namespace Prefix: | tpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Derivative, Maximum Payout + References No definition available. + Details
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Namespace Prefix: | tpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + 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 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Details
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- Details
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- Details
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