Accounting for Stock Based Compensation - Summarizes Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Stock Options Outstanding, beginning balance, Shares	139,684	162,634	206,750
Exercised, Shares	(139,684)	(6,450)	(44,116)
Forfeited, Shares	0	(16,500)	0
Stock Options Outstanding, ending balance, Shares		139,684	162,634	206,750
Stock Options Exercisable, Shares	0
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 35.59	$ 36.41	$ 36.72
Exercised, Weighted-Average Exercise Price	35.59	40.79	37.87
Forfeited, Weighted-Average Exercise Price	0	41.59	0
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	0	$ 35.59	$ 36.41	$ 36.72
Exercisable, Weighted-Average Exercise Price	$ 0
Stock Options Outstanding, Weighted-Average Remaining Contractual Term		10 months 24 days	2 years 8 months 4 days	2 years 7 months 6 days
Stock Options Outstanding, Aggregate Intrinsic Value		$ 2,342	$ 8,212	$ 10,375
Exercisable, Aggregate Intrinsic Value	$ 0

No definition available.

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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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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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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 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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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 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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