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Accounting for Stock Based Compensation - Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	428,000	869,000	1,653,000
Granted, Shares	0	0	0	0
Exercised, Shares	(215,250)	(434,250)	(428,250)
Forfeited, Shares	(6,000)	(6,750)	(355,750)
Stock Options Outstanding, ending balance, Shares	206,750	428,000	869,000	1,653,000
Exercisable, Ending Balance	206,750
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 37.61	$ 37.87	$ 38.53
Exercised, Weighted-Average Exercise Price	38.46	38.12	38.66
Forfeited, Weighted-Average Exercise Price	38.05	38.05	39.99
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	36.72	$ 37.61	$ 37.87	$ 38.53
Exercisable, Weighted Average Exercise Price	$ 36.72
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	2 years 7 months 6 days	3 years 2 months 12 days	3 years 6 months 3 days	4 years 3 months 10 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value	$ 10,375	$ 11,815	$ 5,172	$ 3,610
Exercisable, Aggregate Intrinsic Value	$ 10,375
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	171,600	554,250	988,100
Granted, Shares	0	0	0	0
Exercised, Shares	(116,000)	(342,150)	(179,500)
Forfeited, Shares		(40,500)	(254,350)
Stock Options Outstanding, ending balance, Shares	55,600	171,600	554,250	988,100
Exercisable, Ending Balance	55,600
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 40.60	$ 39.41	$ 40.61
Exercised, Weighted-Average Exercise Price	40.34	38.22	32.84
Forfeited, Weighted-Average Exercise Price		44.39	42.63
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	41.15	$ 40.60	$ 39.41	$ 40.61
Exercisable, Weighted Average Exercise Price	$ 41.15
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	1 year 3 months 10 days	2 years 5 months 8 days	2 years 10 months 2 days	3 years 6 months 25 days
Exercisable, Weighted-Average Remaining Contractual Term	1 year 3 months 10 days
Outstanding, Aggregate Intrinsic Value	$ 2,544	$ 4,224	$ 2,981	$ 2,064
Exercisable, Aggregate Intrinsic Value	$ 2,544

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

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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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