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Stock-Based Compensation - Restricted Stock Activity and Incentive Stock Awards Activity (Detail)
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Weighted Average Grant Date Fair Value  
Outstanding, beginning of period (in dollars per share) | $ / shares $ 73.64
Granted (in dollars per share) | $ / shares 76.67
Vested (in dollars per share) | $ / shares 77.47
Adjustment for incentive stock awards expected to vest (in dollars per share) | $ / shares 71.84
Canceled (in dollars per share) | $ / shares 72.47
Outstanding, end of period (in dollars per share) | $ / shares $ 73.83
Restricted Stock and Units  
Number of Shares  
Outstanding, beginning of period (in shares) 791,031
Granted (in shares) 226,402
Vested (in shares) (291,332)
Adjustment for incentive stock awards expected to vest (in shares) 0
Canceled (in shares) (63,608)
Outstanding, end of period (in shares) 662,493
Incentive Stock Units  
Number of Shares  
Outstanding, beginning of period (in shares) 572,002
Granted (in shares) 247,443
Vested (in shares) (147,069)
Adjustment for incentive stock awards expected to vest (in shares) (176,298)
Canceled (in shares) (52,240)
Outstanding, end of period (in shares) 443,838