Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Excess tax benefits from equity-based compensation	$ 92,234	$ 101,466	$ 77,478
Estimated federal taxable income	$ 768,700	$ 640,243
Statutory federal income tax rate	21.00%		35.00%
Effective tax rate	16.40%	14.36%	16.94%
Unrecognized tax benefits that would affect effective tax rate	$ 29,085
Reversal of accrued interest on unrecognized tax benefits	420	$ 1,467	$ 1,384
Total accrued interest on unrecognized tax benefits	15,304	$ 15,724
Reduction in unrecognized tax benefits	$ 7,700