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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule Of Equity Method Investments [Line Items]        
Revenue $ 5,645,142 $ 5,925,101 $ 16,915,694 $ 16,774,684
Operating income 211,408 316,630 525,863 746,034
Net income 184,840 258,053 440,482 652,317
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]        
Schedule Of Equity Method Investments [Line Items]        
Revenue 513,792 375,717 1,337,212 1,083,664
Operating income 97,833 191,667 411,291 383,490
Net income $ 109,251 $ 189,960 $ 267,835 $ 289,437