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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member]
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Number of SEUs, Beginning balance | shares 390,164
Granted at discount, Number of SEUs | shares 94,151
Granted at market value, Number of SEUs | shares 3,803
Exercised, Number of SEUs | shares (35,384)
Forfeited, Number of SEUs | shares (25,290)
Outstanding, Number of SEUs, Ending balance | shares 427,444
Outstanding, Weighted Average Exercise Price, Beginning balance $ 4.35
Granted at discount, Weighted Average Exercise Price 0.00
Granted at market value, Weighted Average Exercise Price 99.85
Exercised, Weighted Average Exercise Price 13.93
Forfeited, Weighted Average Exercise Price 2.40
Outstanding, Weighted Average Exercise Price, Ending balance 3.57
Outstanding, Weighted Average Grant-Date Fair Value 63.96
Granted at discount, Weighted Average Grant-Date Fair Value 91.83
Granted at market value, Weighted Average Grant-Date Fair Value 32.71
Exercised, Weighted Average Grant-Date Fair Value 45.20
Forfeited, Weighted Average Grant-Date Fair Value 66.53
Outstanding, Weighted Average Grant-Date Fair Value $ 71.22