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Segment reporting - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Number of operating segments			2us-gaap_NumberOfOperatingSegments		2us-gaap_NumberOfOperatingSegments
Number of contracts	3tpre_NumberofContracts	4tpre_NumberofContracts	3tpre_NumberofContracts		3tpre_NumberofContracts	3tpre_NumberofContracts
Gross Premiums Written
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember
Contract One | Contract Concentration Risk | Gross Premiums Written
Revenue, Major Customer [Line Items]
Concentration risk, percentage	60.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember	61.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember	29.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember	18.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember	14.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember	22.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractOneMember
Contract Two | Contract Concentration Risk | Gross Premiums Written
Revenue, Major Customer [Line Items]
Concentration risk, percentage	31.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember	22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember	12.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember	14.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember	11.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember	20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractTwoMember
Contract Three | Contract Concentration Risk | Gross Premiums Written
Revenue, Major Customer [Line Items]
Concentration risk, percentage	14.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember	13.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember	11.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember	11.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember	10.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember	11.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractThreeMember
Contract Four | Contract Concentration Risk | Gross Premiums Written
Revenue, Major Customer [Line Items]
Concentration risk, percentage		12.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractFourMember		11.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = tpre_ContractConcentrationRiskMember / tpre_ContractAxis = tpre_ContractFourMember

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- Definition

Number of Contracts

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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