Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Weighted Average Number of Shares, Deferred Compensation Plans	55,734	55,590	42,751
Weighted average common shares issued	113,914,902	113,914,902	113,914,902
Average treasury shares	(20,089,722)	(18,140,857)	(16,254,304)
Average unearned nonvested shares	(157,403)	(134,565)	(118,261)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	93,612,043	95,583,890	97,499,586
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	219,584	200,712	203,836
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	93,887,447	95,840,285	97,758,965
Weighted Average Number Of Additional Shares Deferred Compensation Plan	55,820	55,683	55,543
Basic Earnings Per Share (in dollars per share)	$ 1.37	$ 1.45	$ 0.75
Diluted Earnings Per Share (in dollars per share)	$ 1.37	$ 1.44	$ 0.75