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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]          
Total income $ 104,027 $ 59,979 $ 240,124 $ 179,243  
Net income     24,873 20,144  
Balance Sheet:          
Total assets 887,813   887,813   $ 802,609
Total liabilities 688,081   688,081   617,066
Limited Partnership [Member]          
Schedule Of Equity Method Investments [Line Items]          
Total income 259,635 (100,043) (1,421,381) 147,858  
Total expenses (26,637) (27,212) (107,157) (108,385)  
Net income 232,998 $ (127,255) (1,528,538) $ 39,473  
Balance Sheet:          
Total assets 5,409,112   5,409,112   6,850,913
Total liabilities $ 638,784   $ 638,784   $ 549,562