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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net Investment Income [Line Items]        
Net investment income $ 8,852 $ 6,527 $ 26,234 $ 22,488
Net realized investment gains (losses) (10,778) 1,158 (7,216) 40,226
Change in unrealized holding gains and losses (10,420) (11,876) (15,575) (43,650)
Net realized and unrealized investment returns (21,198) (10,718) (22,791) (3,424)
Total investment return $ (12,346) $ (4,191) $ 3,443 $ 19,064
Total investment return % [1] (0.70%) (0.30%) 0.20% 1.20%
Average investment portfolio [2] $ 1,800,993 $ 1,558,501 $ 1,788,777 $ 1,541,336
[1] Not annualized.
[2] Average of total cash and invested assets, net of receivable/payable for securities purchased and sold, as of the beginning and end of the period.