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Stock-Based Compensation Plans - Summary of Transactions of the Company's Stock Option Plans (Detail) - Stock Options Plan [Member]
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Number of Options, Beginning balance | shares 504,459
Exercised, Number of Options | shares (92,551)
Forfeited, Number of Options | shares (19,837)
Outstanding, Number of Options, Ending balance | shares 466,440
Outstanding, Weighted Average Exercise Price, Beginning balance $ 33.05
Exercised, Weighted Average Exercise Price 12.84
Forfeited, Weighted Average Exercise Price 34.07
Outstanding, Weighted Average Exercise Price, Ending balance 34.04
Outstanding, Weighted Average Grant-Date Fair Value 41.35
Exercised, Weighted Average Grant-Date Fair Value 48.71
Forfeited, Weighted Average Grant-Date Fair Value 40.65
Outstanding, Weighted Average Grant-Date Fair Value $ 44.27
Discount [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Number of Options | shares 63,950
Granted, Weighted Average Exercise Price $ 1.11
Granted, Weighted Average Grant-Date Fair Value $ 76.80
Market Value [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Number of Options | shares 10,419
Granted, Weighted Average Exercise Price $ 95.70
Granted, Weighted Average Grant-Date Fair Value $ 18.69