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, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Weighted Average Number of Shares, Deferred Compensation Plans	55,590	42,751	37,496
Weighted average common shares issued	113,914,902	113,914,902	113,914,902
Average treasury shares	(18,140,857)	(16,254,304)	(15,447,299)
Average unearned nonvested shares	(134,565)	(118,261)	(112,320)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	95,583,890	97,499,586	98,317,787
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	200,712	203,836	231,957
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	95,840,285	97,758,965	98,588,164
Weighted Average Number Of Additional Shares Deferred Compensation Plan	55,683	55,543	38,420
Basic Earnings Per Share (in dollars per share)	$ 1.45	$ 0.75	$ 1.07
Diluted Earnings Per Share (in dollars per share)	$ 1.44	$ 0.75	$ 1.07