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Reinsurance premiums ceded (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Loss and loss expenses recovered | $ 2,100,000 us-gaap_ReinsuranceCostsAndRecoveriesNet | $ 1,000,000 us-gaap_ReinsuranceCostsAndRecoveriesNet | $ 6,300,000 us-gaap_ReinsuranceCostsAndRecoveriesNet | $ 9,300,000 us-gaap_ReinsuranceCostsAndRecoveriesNet |  |
Loss and loss adjustment expenses recoverable | $ 6,284,000 us-gaap_ReinsuranceRecoverables | $ 1,412,000 us-gaap_ReinsuranceRecoverables | $ 6,284,000 us-gaap_ReinsuranceRecoverables | $ 9,277,000 us-gaap_ReinsuranceRecoverables | $ 0 us-gaap_ReinsuranceRecoverables | $ 0 us-gaap_ReinsuranceRecoverables
AM Best, A Rating |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Number of retrocessionaire |  | 1 tpre_NumberofRetrocessionaire / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember |  | 1 tpre_NumberofRetrocessionaire / us-gaap_CreditRatingAMBestAxis = us-gaap_AMBestARatingMember |  |

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- Definition Number of Retrocessionaire + References No definition available. + Details
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- Definition Amount of recovery (expense) related to provision for policy benefits and costs incurred for policies assumed and ceded. + 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 + 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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