Accounting for Stock Based Compensation - Summarizes SARs Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	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	162,634	206,750	428,000
Granted, Shares	0	0	0	0	0	0
Exercised, Shares	(6,450)	(44,116)	(215,250)
Forfeited, Shares	(16,500)		(6,000)
Stock Options Outstanding, ending balance, Shares	139,684	162,634	206,750	428,000
Exercisable, Ending Balance	139,684
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 36.41	$ 36.72	$ 37.61
Exercised, Weighted-Average Exercise Price	40.79	37.87	38.46
Forfeited, Weighted-Average Exercise Price	41.59		38.05
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	35.59	$ 36.41	$ 36.72	$ 37.61
Exercisable, Weighted Average Exercise Price	$ 35.59
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	10 months 24 days	2 years 8 months 4 days	2 years 7 months 6 days	3 years 2 months 12 days
Exercisable, Weighted-Average Remaining Contractual Term	10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 2,342	$ 8,212	$ 10,375	$ 11,815
Exercisable, Aggregate Intrinsic Value	$ 2,342
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	14,750	55,600	171,600
Granted, Shares	0	0	0	0	0	0
Exercised, Shares	(12,500)	(40,850)	(116,000)
Stock Options Outstanding, ending balance, Shares	2,250	14,750	55,600	171,600
Exercisable, Ending Balance	2,250
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.05	$ 41.15	$ 40.6
Exercised, Weighted-Average Exercise Price	38.05	42.27	40.34
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	38.05	$ 38.05	$ 41.15	$ 40.6
Exercisable, Weighted Average Exercise Price	$ 38.05
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	1 month 24 days	1 year 1 month 24 days	1 year 3 months 10 days	2 years 5 months 8 days
Exercisable, Weighted-Average Remaining Contractual Term	1 month 24 days
Outstanding, Aggregate Intrinsic Value	$ 32	$ 402	$ 2,544	$ 4,224
Exercisable, Aggregate Intrinsic Value	$ 32