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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Equity Method Investments And Joint Ventures [Abstract]        
Revenue $ 412,169 $ 342,822 $ 823,420 $ 707,947
Operating income 138,924 97,202 313,458 191,823
Net income $ 54,055 $ 50,549 $ 158,584 $ 99,477