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Segment reporting - Geographic information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										9 Months Ended		12 Months Ended
	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
Revenue from External Customer [Line Items]
Gross premiums written	$ 126,403us-gaap_AssumedPremiumsWritten	$ 162,277us-gaap_AssumedPremiumsWritten	$ 45,425us-gaap_AssumedPremiumsWritten	$ 98,215us-gaap_AssumedPremiumsWritten	$ 96,020us-gaap_AssumedPremiumsWritten	$ 27,895us-gaap_AssumedPremiumsWritten	$ 41,651us-gaap_AssumedPremiumsWritten	$ 28,178us-gaap_AssumedPremiumsWritten	$ 92,650us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten	$ 359,498us-gaap_AssumedPremiumsWritten	$ 239,660us-gaap_AssumedPremiumsWritten	$ 401,937us-gaap_AssumedPremiumsWritten	$ 190,374us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten
Gross Premiums Written
Revenue from External Customer [Line Items]
Gross premiums written	126,403us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember		45,425us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember								359,498us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	239,660us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	401,937us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember	190,374us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember
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
Gross Premiums Written | United States
Revenue from External Customer [Line Items]
Gross premiums written	85,686us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US		7,665us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US								288,420us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	151,314us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	304,141us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	190,374us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US
Concentration risk, percentage	67.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US		16.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US								80.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	63.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	75.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US	100.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_US
Gross Premiums Written | United Kingdom
Revenue from External Customer [Line Items]
Gross premiums written	(812)us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB		0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB								24,600us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB	0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB
Concentration risk, percentage	(0.60%)us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB		0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB								6.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB	0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_GB
Gross Premiums Written | Bermuda
Revenue from External Customer [Line Items]
Gross premiums written	41,529us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM		37,760us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM								46,478us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	86,946us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	96,396us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM
Concentration risk, percentage	32.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM		83.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM								12.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	36.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	24.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM	0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = country_BM
Gross Premiums Written | Other
Revenue from External Customer [Line Items]
Gross premiums written	$ 0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember		$ 0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember								$ 0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	$ 1,400us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	$ 1,400us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	$ 0us-gaap_AssumedPremiumsWritten / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember
Concentration risk, percentage	0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember		0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember								0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	0.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	0.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember	0.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_StatementGeographicalAxis = tpre_OtherGeographicalLocationMember

X

- Definition

Amount of written premiums assumed from other entities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

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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

-SubTopic 10

-Section 50

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