Accounting for Stock Based Compensation - Summarizes Stock Option 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 Payment Arrangement [Abstract]
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
Stock Options Exercisable, Shares	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
Stock Options Outstanding, Aggregate Intrinsic Value	$ 2,342	$ 8,212	$ 10,375	$ 11,815
Exercisable, Aggregate Intrinsic Value	$ 2,342