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Significant accounting policies (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 segment | Dec. 31, 2013 segment
Accounting Policies [Abstract] |  |
Premium deficiency loss | $ 0 tpre_PremiumDeficiencyLoss | $ 0 tpre_PremiumDeficiencyLoss
Number of operating segments | 2 us-gaap_NumberOfOperatingSegments | 2 us-gaap_NumberOfOperatingSegments

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- Definition Premium deficiency loss represents the expensing for unrecoverability of deferred acquisition costs for which the sum of future earned premiums and anticipated investment income is less than the expected future claims and expenses. If a loss is probable on the unexpired portion of policies in force, a premium deficiency loss is recognized. + References No definition available. + Details
Name: | tpre_PremiumDeficiencyLoss
Namespace Prefix: | tpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration