Accounting for Stock Based Compensation - Summarizes SARs 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 Compensation Arrangement By Share Based Payment Award [Line Items]
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
Exercisable, Ending Balance	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
Outstanding, Aggregate Intrinsic Value		$ 2,342	$ 8,212	$ 10,375
Exercisable, Aggregate Intrinsic Value	$ 0
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	2,250	14,750	55,600
Exercised, Shares	(2,250)	(12,500)	(40,850)
Stock Options Outstanding, ending balance, Shares		2,250	14,750	55,600
Exercisable, Ending Balance	0
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.05	$ 38.05	$ 41.15
Exercised, Weighted-Average Exercise Price	38.05	38.05	42.27
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price		$ 38.05	$ 38.05	$ 41.15
Exercisable, Weighted Average Exercise Price	$ 0
Stock Options Outstanding, Weighted-Average Remaining Contractual Term		1 month 24 days	1 year 1 month 24 days	1 year 3 months 10 days
Outstanding, Aggregate Intrinsic Value		$ 32	$ 402	$ 2,544
Exercisable, Aggregate Intrinsic Value	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 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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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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