Stock Plans - Summary of Stock Option Activity (Detail) - $ / shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Beginning balance, outstanding (in shares)	58,156	161,701	283,998
Exercised (in shares)	(31,394)	(103,545)	(122,087)
Forfeited (in shares)	(226)		(210)
Ending balance, outstanding (in shares)	26,536	58,156	161,701
Weighted Average Exercise Price
Beginning, weighted average exercise price (in dollars per share)	$ 46.48	$ 45.47	$ 46.23
Exercised (in dollars per share)	46.90	44.91	47.25
Forfeited (in dollars per share)	49.44		43.75
Ending, weighted average exercise price (in dollars per share)	$ 45.95	$ 46.48	$ 45.47
Exercisable at year-end (in shares)	26,536	58,156	161,347

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- Definition

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 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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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 option holders acquired shares when converting their stock options into shares.

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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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- Definition

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

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