Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 2,725,599	$ 3,046,507	$ 3,002,378	$ 3,103,074
Net income	433,314	321,295	859,414	570,057
Purchase of common stock for treasury	(266,915)	(376,941)	(1,015,703)	(754,366)
Equity-based compensation	20,087	13,379	31,755	27,850
Proceeds from Options exercised	79,581	38,048	113,822	95,673
Ending Balance	$ 2,991,666	$ 3,042,288	$ 2,991,666	$ 3,042,288
Common stock repurchased (in shares)	61,078	78,452	207,132	164,975
Reissued shares during the period, shares (in shares)	30,396	18,033	43,719	48,588
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 206	$ 206	$ 206	$ 206
Ending Balance	206	206	206	206
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,416,660	2,272,006	2,378,191	2,214,426
Equity-based compensation	20,087	13,379	31,755	27,850
Proceeds from Options exercised	79,581	38,048	113,822	95,673
Treasury stock issued upon Option exercise	(18,205)	(8,869)	(25,645)	(23,385)
Ending Balance	2,498,123	2,314,564	2,498,123	2,314,564
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	10,473,939	9,059,882	10,047,839	8,811,120
Net income	433,314	321,295	859,414	570,057
Ending Balance	10,907,253	9,381,177	10,907,253	9,381,177
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(10,165,206)	(8,285,587)	(9,423,858)	(7,922,678)
Purchase of common stock for treasury	(266,915)	(376,941)	(1,015,703)	(754,366)
Treasury stock issued upon Option exercise	18,205	8,869	25,645	23,385
Ending Balance	(10,413,916)	(8,653,659)	(10,413,916)	(8,653,659)
Deferred Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(16,710)	(16,710)	(16,710)	(16,710)
Ending Balance	(16,710)	(16,710)	(16,710)	(16,710)
Deferred Compensation Liability
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,710	16,710	16,710	16,710
Ending Balance	$ 16,710	$ 16,710	$ 16,710	$ 16,710