Stock-Based Compensation Plans - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	387,372	550,591	575,564
Number of Shares, Granted	17,897	13,900	82,474
Number of Shares, Canceled	(616)	(218)	(548)
Number of Shares, Exercised	(91,900)	(176,901)	(106,899)
Number of Shares, Ending Balance	312,753	387,372	550,591
Number of Shares, Exercisable	59,215
Weighted Average Exercise Price, Beginning Balance	$ 223.60	$ 175.16	$ 132.93
Weighted Average Exercise Price, Granted	517.88	368.10	279.57
Weighted Average Exercise Price, Canceled	394.77	307.52	198.67
Weighted Average Exercise Price, Exercised	107.05	84.07	28.24
Weighted Average Exercise Price, Ending Balance	274.35	$ 223.60	$ 175.16
Weighted Average Exercise Price, Exercisable	$ 190.13
Remaining Contractual Term, Outstanding at December 31, 2021	2 years 6 months
Remaining Contractual Term, Exercisable at December 31, 2021	1 year 8 months 12 days
Intrinsic Value, Exercised	$ 32,529
Intrinsic Value, Ending Balance	44,710
Intrinsic Value, Exercisable	$ 13,095

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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