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Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 108,948 us-gaap_PremiumsEarnedNet | $ 58,510 us-gaap_PremiumsEarnedNet | $ 66,329 us-gaap_PremiumsEarnedNet | $ 62,287 us-gaap_PremiumsEarnedNet | $ 33,541 us-gaap_PremiumsEarnedNet | $ 33,485 us-gaap_PremiumsEarnedNet | $ 34,318 us-gaap_PremiumsEarnedNet | $ 14,841 us-gaap_PremiumsEarnedNet | $ 13,837 us-gaap_PremiumsEarnedNet | $ 0 us-gaap_PremiumsEarnedNet | $ 260,960 us-gaap_PremiumsEarnedNet | $ 162,157 us-gaap_PremiumsEarnedNet | $ 220,667 us-gaap_PremiumsEarnedNet | $ 96,481 us-gaap_PremiumsEarnedNet | $ 0 us-gaap_PremiumsEarnedNet
Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct gross premiums written |  |  |  |  |  |  |  |  |  | 0 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |  |  | 0 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember | 0 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |
Ceded to other companies |  |  |  |  |  |  |  |  |  | 0 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |  |  | 9,975 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember | 0 us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |
Assumed from other companies |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |  |  | 401,937 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember | 190,374 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |
Net premiums earned |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |  |  | $ 391,962 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember | $ 190,374 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |
Percentage of amount assumed to net |  |  |  |  |  |  |  |  |  |  |  |  | 98.00%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember | 100.00%us-gaap_PremiumsPercentageAssumedToNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = tpre_PropertyandCasualtyReinsuranceMember |

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Percentage of assumed premiums earned by the entity to net premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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