Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Weighted Average Number of Shares Issued, Basic	123,603,380	113,914,902	122,503,223	113,914,902
Average treasury shares (in shares)	(21,222,298)	(20,485,573)	(20,849,426)	(19,938,539)
Weighted Average Number of Shares, Deferred Compensation Plans	(56,402)	(55,751)	(56,029)	(55,716)
Average unearned nonvested shares	(165,467)	(178,724)	(169,703)	(159,287)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	102,159,213	93,194,854	101,428,065	93,761,360
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	226,939	199,620	190,178	177,013
Weighted Average Number Of Additional Shares Deferred Compensation Plan	56,726	55,785	56,727	55,785
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	102,442,878	93,450,259	101,674,970	93,994,158
Basic Earnings per Share (in dollars per share)	$ 0.38	$ 0.36	$ 1.11	$ 0.99
Diluted Earnings per Share (in dollars per share)	$ 0.38	$ 0.36	$ 1.10	$ 0.98