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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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	1,653,000	2,652,142	2,103,470
Granted, Shares	0	0	808,500
Exercised, Shares	(428,250)	(615,358)	(202,328)
Forfeited, Shares	(355,750)	(383,784)	(57,500)
Stock Options Outstanding, ending balance, Shares	869,000	1,653,000	2,652,142	2,103,470
Exercisable, Ending Balance	665,000	788,125	984,374
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.53	$ 35.34	$ 32.72
Granted, Weighted-Average Exercise Price			37.23
Exercised, Weighted-Average Exercise Price	38.66	24.01	13.62
Forfeited, Weighted-Average Exercise Price	39.99	39.59	42.54
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	37.87	38.53	35.34	$ 32.72
Exercisable, Weighted Average Exercise Price	$ 38.10	$ 38.15	$ 29.84
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	3 years 6 months 3 days	4 years 3 months 10 days	4 years 9 months 3 days	4 years 10 months 9 days
Exercisable, Weighted-Average Remaining Contractual Term	3 years 2 months 23 days	3 years 8 months 15 days	3 years 5 months 8 days
Outstanding, Aggregate Intrinsic Value	$ 5,172	$ 3,610	$ 6,964	$ 12,265
Exercisable, Aggregate Intrinsic Value	$ 3,725	$ 2,200	$ 6,534
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	988,100	1,192,350	1,244,600
Granted, Shares			235,000
Exercised, Shares	(179,500)	(204,250)	(94,250)
Forfeited, Shares	(254,350)		(193,000)
Stock Options Outstanding, ending balance, Shares	554,250	988,100	1,192,350	1,244,600
Exercisable, Ending Balance	401,438	683,600	613,808
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 40.61	$ 38.17	$ 36.11
Granted, Weighted-Average Exercise Price			38.05
Exercised, Weighted-Average Exercise Price	32.84	26.35	22.21
Forfeited, Weighted-Average Exercise Price	42.63		32.53
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	39.41	40.61	38.17	$ 36.11
Exercisable, Weighted Average Exercise Price	$ 39.62	$ 41.21	$ 37.68
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	2 years 10 months 2 days	3 years 6 months 25 days	4 years 4 months 9 days	4 years 9 months 18 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 5 months 15 days	3 years 1 month 2 days	3 years 8 months 19 days
Outstanding, Aggregate Intrinsic Value	$ 2,981	$ 2,064	$ 2,278	$ 3,511
Exercisable, Aggregate Intrinsic Value	$ 2,135	$ 1,728	$ 1,904

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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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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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