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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]        
Revenue $ 375,717 $ 392,945 $ 1,083,664 $ 1,181,174
Operating income 191,667 522,989 383,490 895,378
Net income $ 189,960 $ 455,887 $ 289,437 $ 711,711