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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 3,042,288 $ 2,612,412 $ 3,103,074 $ 2,341,244
Net income 332,081 256,466 902,138 596,244
Purchase of common stock for treasury (398,489)   (1,152,855) (216,582)
Equity-based compensation 15,009 13,639 42,859 35,565
Proceeds from Options exercised 26,162 36,476 121,835 162,522
Ending Balance $ 3,017,051 2,918,993 $ 3,017,051 $ 2,918,993
Common stock repurchased (in shares) 80   245 58
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 206 206 $ 206 $ 206
Ending Balance 206 206 206 206
Additional Paid-in Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 2,314,564 2,151,623 2,214,426 2,055,407
Equity-based compensation 15,009 13,639 42,859 35,565
Proceeds from Options exercised 26,162 36,476 121,835 162,522
Treasury stock issued upon option exercise and restricted share vesting (6,735) (13,531) (30,120) (65,287)
Ending Balance 2,349,000 2,188,207 2,349,000 2,188,207
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 9,381,177 8,249,650 8,811,120 7,909,872
Net income 332,081 256,466 902,138 596,244
Ending Balance 9,713,258 8,506,116 9,713,258 8,506,116
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (8,653,659) (7,789,067) (7,922,678) (7,624,241)
Purchase of common stock for treasury (398,489)   (1,152,855) (216,582)
Treasury stock issued upon option exercise and restricted share vesting (6,735) (13,531) (30,120) (65,287)
Ending Balance (9,045,413) (7,775,536) (9,045,413) (7,775,536)
Deferred Compensation Trust [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (16,710) (16,710) (16,710) (16,912)
Ending Balance (16,710) (16,710) (16,710) (16,710)
Deferred Compensation Activity Adjustments       (202)
Deferred Compensation Liability [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 16,710 16,710 16,710 16,912
Ending Balance $ 16,710 $ 16,710 $ 16,710 16,710
Deferred Compensation Activity Adjustments       $ (202)