Financial instruments with off-balance sheet risk or concentrations of credit risk (Details) (USD $)	9 Months Ended	12 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Asset	$ 37,260,000	$ 39,045,000	$ 25,628,000
Liability	12,346,000	8,819,000	12,992,000
Credit spread			0.44%tpre_CreditDerivativeCreditSpread
Written Credit Derivatives
Guarantor Obligations [Line Items]
Credit Derivative, Collateral		1,600,000
Derivative, Maximum Payout	875,600,000	689,500,000
Derivative, Fair Value, Net	(1,345,000)	809,000
0-5 years	0	9,882,000
5 years or Greater Expiring Through 2046	7,755,000	550,000
Total Written Credit Default Swaps	7,755,000	10,432,000
Asset	158,000	1,157,000
Liability	1,503,000	348,000
Net Asset/(Liability)	(1,345,000)	809,000
Written Credit Derivatives \| Single name (0 - 250)
Guarantor Obligations [Line Items]
Derivative, Fair Value, Net	(1,503,000)	(104,000)
0-5 years	0	368,000
5 years or Greater Expiring Through 2046	5,437,000	0
Total Written Credit Default Swaps	5,437,000	368,000
Asset	0	0
Liability	1,503,000	104,000
Net Asset/(Liability)	(1,503,000)	(104,000)
Written Credit Derivatives \| Single name (251-500)
Guarantor Obligations [Line Items]
Derivative, Fair Value, Net	158,000	1,136,000
0-5 years	0	9,514,000
5 years or Greater Expiring Through 2046	2,318,000	0
Total Written Credit Default Swaps	2,318,000	9,514,000
Asset	158,000	1,136,000
Liability	0	0
Net Asset/(Liability)	158,000	1,136,000
Written Credit Derivatives \| Index (0-250)
Guarantor Obligations [Line Items]
Derivative, Fair Value, Net		(223,000)
0-5 years		0
5 years or Greater Expiring Through 2046		550,000	400,000
Total Written Credit Default Swaps		550,000
Asset		21,000	200,000
Liability		244,000
Net Asset/(Liability)		(223,000)
Written Credit Derivatives \| Estimate of Fair Value Measurement
Guarantor Obligations [Line Items]
Derivative, Fair Value, Net	8,000,000	2,600,000
Net Asset/(Liability)	8,000,000	2,600,000
Credit risk exposure
Guarantor Obligations [Line Items]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 25,300,000	$ 19,000,000	$ 17,000,000

Credit Derivative, Collateral

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- Definition

Credit Derivative, Credit Spread

+ References

No definition available.

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- Definition

Credit Derivative, Maximum Exposure, Undiscounted, After Year Five

+ References

No definition available.

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- Definition

Credit Derivative , Maximum Exposure, Undiscounted, Through Year Five

+ References

No definition available.

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- Definition

Derivative, Maximum Payout

+ References

No definition available.

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- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (b)

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Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

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-Publisher FASB

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-Topic 815

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Credit Derivative

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- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

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-Topic 210

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Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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-Topic 825

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