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Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Provision for income taxes $ 133,507 $ 49,062 $ 343,279 $ 119,047  
Increase (decrease) in income taxes $ 84,400   $ 224,200    
Effective tax rate 23.40% 21.00% 23.00% 21.30%  
Federal statutory tax rate 21.00%   21.00%    
Unrecognized tax benefits $ 182,600   $ 182,600   $ 168,500
Increase in unrecognized tax benefits     14,100    
Change in unrecognized tax benefits     19,800    
Unrecognized tax benefits expiration of statute of limitations in various tax jurisdictions     $ 5,700