Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 3,002,378	$ 3,103,074
Net income	426,100	248,762
Purchase of common stock for treasury	(748,788)	(377,425)
Equity-based compensation	11,668	14,471
Proceeds from Options exercised	34,241	57,625
Ending Balance	2,725,599	3,046,507
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	206	206
Ending Balance	206	206
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,378,191	2,214,426
Equity-based compensation	11,668	14,471
Proceeds from Options exercised	34,241	57,625
Treasury stock issued upon Option exercise and restricted share vesting	(7,440)	(14,516)
Ending Balance	2,416,660	2,272,006
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	10,047,839	8,811,120
Net income	426,100	248,762
Ending Balance	10,473,939	9,059,882
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(9,423,858)	(7,922,678)
Purchase of common stock for treasury	(748,788)	(377,425)
Treasury stock issued upon Option exercise and restricted share vesting	7,440	14,516
Ending Balance	(10,165,206)	(8,285,587)
Deferred Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(16,710)	(16,710)
Ending Balance	(16,710)	(16,710)
Deferred Compensation Liability
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,710	16,710
Ending Balance	$ 16,710	$ 16,710