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Related party transactions (Details) (USD $)	3 Months Ended		6 Months Ended										6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Narragansett Bay Insurance Company	Jun. 30, 2013 Narragansett Bay Insurance Company	Jun. 30, 2014 Pine Brook Road Partners, LLC	Dec. 31, 2013 Pine Brook Road Partners, LLC	Jun. 30, 2014 Cayman Holdco	Dec. 31, 2013 Cayman Holdco	Jun. 30, 2014 Third Point Loan L.L.C Investments in Securities and Derivative Contract	Dec. 31, 2013 Third Point Loan L.L.C Investments in Securities and Derivative Contract	Jun. 30, 2014 Third Point Hellenic Recovery US Feeder Fund, L.P.	Dec. 31, 2013 Third Point Hellenic Recovery US Feeder Fund, L.P.
Related Party Transaction [Line Items]
Gross premiums written	$ 145,508,000	$ 98,215,000	$ 233,095,000	$ 194,235,000	$ 3,500,000	$ 3,000,000
Ownership percentage										10.00%
Ownership percentage							12.00%	12.00%	10.70%	10.00%			2.00%	2.00%
Committed capital													11,400,000
Committed capital, amount called													50,000
Committed capital, amount distributed													400,000
Estimated fair value of investment									$ 66,500,000	$ 29,300,000	$ 72,600,000	$ 147,200,000	$ 5,800,000	$ 5,300,000

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Committed Capital

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Committed Capital, Amount Distributed

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Ownership Percentage

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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

-Section 50

-Paragraph 1

-Subparagraph (b)(2),(c)(2)

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.12)

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