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Net investment income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net Investment Income [Abstract]        
Net realized gains on investments and investment derivatives $ (62,448) $ 7,404 $ (67,407) $ 31,709
Net unrealized gains (losses) on investments and investment derivatives 53,378 63,778 184,686 176,673
Net realized gain (loss) on foreign currencies 13,125 (1,353) 4,851 4,364
Dividend and interest income 6,628 4,287 22,405 15,587
Dividends paid on securities sold, not yet purchased 0 (171) (34) (607)
Management and performance fees (8,440) (19,558) (46,630) (57,750)
Other expenses (1,573) (1,860) (6,743) (4,383)
Net investment income on investments managed by Third Point LLC 670 52,527 91,128 165,593
Investment income on cash held by the Catastrophe Reinsurer and Catastrophe Fund 27 28 84 44
Net gain on catastrophe bond held by Catastrophe Reinsurer 75 0 80 0
Net gain on reinsurance contract derivatives written by the Catastrophe Reinsurer 780 2,062 780 3,167
Net investment income 1,552 54,617 92,072 168,804
Net investment gains on equity securities
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income 6,282 60,042 56,927 167,364
Net investment gains (losses) on debt securities
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income (5,435) 14,950 81,540 57,549
Net investment gains (loss) on other investments
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income (25,807) (4,595) (30,787) (1,517)
Net investment gains on investment derivatives
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income 18,446 751 10,412 19,143
Net investment gains (losses) on securities sold, not yet purchased
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income 4,861 5,857 20,245 (16,017)
Net investment income (loss) on cash, including foreign exchange gains (losses)
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income 15,095 (2,906) 5,921 2,243
Net investment gains (losses) on securities purchased under and agreement to resell
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income (2,381) 1,207 (2,592) 1,228
Management and performance fees
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income (8,440) (19,558) (46,630) (57,750)
Other investment expenses
        
Schedule of Cost-method Investments [Line Items]        
Change in net investment income $ (1,069) $ (1,131) $ (2,964) $ (3,439)