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Schedule of Total Investment Return (Detail) (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 [Line Items]        
Net investment income $ 6,527 $ 8,486 $ 22,488 $ 28,285
Net realized investment gains 1,158 1,641 40,226 10,204
Change in unrealized investment gains (losses) (11,876) 10,471 (43,650) 7,291
Net investment return (10,718) 12,112 (3,424) 17,495
Total investment return (4,191) 20,598 19,064 45,780
Total investment return % (0.30%) [1] 1.30% [1] 1.20% [1] 3.00% [1]
Average investment portfolio $ 1,558,501 [2] $ 1,535,589 [2] $ 1,541,336 [2] $ 1,537,693 [2]
[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.