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Share-Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Outstanding Beginning Balance (in shares) 4,092 4,817 5,156
Granted (in shares) 162 432 824
Exercised (in shares) (999) (1,126) (1,113)
Forfeited (in shares) (29) (31) (50)
Outstanding Ending Balance (in shares) 3,226 4,092 4,817
Exercisable (in shares) 2,067    
Weighted Average Exercise Price      
Outstanding Beginning Balance (in dollar per share) $ 129.51 $ 107.91 $ 83.64
Granted (in dollars per share) 251.58 208.21 176.26
Exercised (in dollars per share) 96.92 66.53 44.80
Forfeited (in dollars per share) 174.54 158.80 134.83
Outstanding Ending Balance (in dollars per share) 145.27 $ 129.51 $ 107.91
Exercisable (in dollars per share) $ 121.07    
Weighted Average Remaining Contractual Life (Years), Outstanding 6 years    
Weighted Average Remaining Contractual Life (Years), Exercisable 6 years    
Aggregate Intrinsic Value, Outstanding $ 499,124    
Aggregate Intrinsic Value, Exercisable $ 369,938