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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]        
Revenue $ 6,458,613 $ 5,381,384 $ 12,397,492 $ 11,270,552
Operating income 366,482 94,165 635,566 314,455
Net income 443,442 82,112 712,419 255,642
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Equity Method Investments [Line Items]        
Revenue 906,765 412,169 1,462,622 823,420
Operating income 431,539 138,924 707,001 313,458
Net income $ 1,108,718 $ 54,055 $ 1,476,935 $ 158,584