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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity Method Investments And Joint Ventures [Abstract]    
Revenue $ 411,251 $ 365,125
Operating income 174,534 94,621
Net income $ 104,528 $ 48,928