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Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Operating results:          
Total income (loss) $ 69,808 $ 61,262 $ 192,075 $ 222,540  
Limited Partnership [Member]          
Operating results:          
Total income (loss) 166,374 82 143,305 (4,756)  
Total expenses (54,577) (386) (184,598) (1,343)  
Net (loss) income 111,797 $ (304) (41,293) $ (6,099)  
Balance Sheet:          
Total assets 2,902,014   2,902,014   $ 288,351
Total liabilities $ 581,615   $ 581,615   $ 28,105