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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]        
Revenue $ 342,822 $ 445,030 $ 707,947 $ 788,229
Operating income 97,202 236,181 191,823 372,389
Net income $ 50,549 $ 161,828 $ 99,477 $ 255,824