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Non-controlling interests - Narrative (Details) (USD $)
6 Months Ended
Jun. 15, 2012
Jun. 30, 2014
Third Point Reinsurance Opportunities Fund Ltd
Dec. 31, 2013
Third Point Reinsurance Opportunities Fund Ltd
Jun. 30, 2014
Hiscox
Catastrophe Fund Manager
Jun. 30, 2014
Joint Venture - Third Point Advisors LLC share
Jun. 30, 2013
Joint Venture - Third Point Advisors LLC share
Noncontrolling Interest [Line Items]            
Estimated fair value of investment   $ 55,400,000 $ 54,800,000      
Ownership percentage   49.90% 53.00%      
Ownership percentage 85.00%     15.00%    
Ownership percentage of nonparticipating shares   100.00%        
Ownership percentage of participating shares   100.00%        
Distributions         $ 51,000,000 $ 35,100,000