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Commitments and Contingencies - Letters of credit (Details) (USD $)						9 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Letter of Credit	Dec. 31, 2013 Letter of Credit	Sep. 30, 2014 Letter of Credit Restricted cash and cash equivalents	Dec. 31, 2013 Letter of Credit Restricted cash and cash equivalents	Sep. 30, 2014 Letter of Credit BNP Paribas	Sep. 30, 2014 Letter of Credit Citibank	Jul. 09, 2014 Letter of Credit Citibank	Jul. 08, 2014 Letter of Credit Citibank	Sep. 30, 2014 Letter of Credit J.P. Morgan
Line of Credit Facility [Line Items]
Facility		$ 400,000,000				$ 100,000,000	$ 250,000,000	$ 250,000,000	$ 150,000,000	$ 50,000,000
Notice period (Unused Facility Portion)						60 days	90 days			60 days
Letters of credit outstanding		160,100,000	127,300,000
Letters of credit outstanding as percentage of total facility		40.00%	42.40%
Cash and cash equivalents pledged as security				160,600,000	100,600,000
Unfunded capital commitment	$ 5,500,000

X

- Definition

Line of Credit Facility, Amount Outstanding, As A Percentage of Maximum Borrowing Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	tpre_
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Balance Type:	na
Period Type:	instant

X

- Definition

Termination Notice Period For Line of Credit Facilities

+ References

No definition available.

+ Details

Name:	tpre_TerminationNoticePeriodForLineofCreditFacilities
Namespace Prefix:	tpre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729

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