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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Investment Income [Line Items]        
Net investment income $ 9,141 $ 7,677 $ 17,382 $ 15,961
Net realized investment gains 6,532 39,881 3,562 39,068
Change in unrealized investment losses (9,752) (29,203) (5,155) (31,774)
Net realized and unrealized investment returns (3,220) 10,678 (1,593) 7,294
Total investment return $ 5,921 $ 18,355 $ 15,789 $ 23,255
Total investment return % [1] 0.30% 1.20% 0.90% 1.50%
Average investment portfolio [2] $ 1,776,326 $ 1,577,630 $ 1,758,103 $ 1,585,304
[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.