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Stock-Based Compensation - Schedule of Information Related to Stock Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Stock Options, Outstanding | shares 44,813
Number of Stock Options, Exercised | shares 19,520
Number of Stock Options, Expected to vest | shares 25,293
Weighted-average Exercise Price, Outstanding | $ / shares $ 89.76
Weighted-average Exercise Price, Exercised | $ / shares 113.65
Weighted-average Exercise Price, Expected to vest | $ / shares $ 71.32
Weighted-average Remaining Contractual Term, Outstanding 4 years 11 months 15 days
Weighted-average Remaining Contractual Term, Exercisable 5 years 18 days
Weighted-average Remaining Contractual Term, Expected to vest 4 years 10 months 20 days
Weighted-average Intrinsic Value, Outstanding | $ $ 3,324
Weighted-average Intrinsic Value, Exercisable | $ 3,324
Weighted-average Intrinsic Value, Expected to vest | $ $ 0