Accounting for Stock Based Compensation - Summarizes Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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	206,750	428,000	869,000
Granted, Shares	0	0	0	0	0
Exercised, Shares	(44,116)	(215,250)	(434,250)
Forfeited, Shares		(6,000)	(6,750)
Stock Options Outstanding, ending balance, Shares	162,634	206,750	428,000	869,000
Stock Options Exercisable, Shares	162,634
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 36.72	$ 37.61	$ 37.87
Exercised, Weighted-Average Exercise Price	37.87	38.46	38.12
Forfeited, Weighted-Average Exercise Price		38.05	38.05
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	36.41	$ 36.72	$ 37.61	$ 37.87
Exercisable, Weighted-Average Exercise Price	$ 36.41
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	2 years 8 months 4 days	2 years 7 months 6 days	3 years 2 months 12 days	3 years 6 months 3 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 8 months 4 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 8,212	$ 10,375	$ 11,815	$ 5,172
Exercisable, Aggregate Intrinsic Value	$ 8,212