Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Weighted Average Number of Shares Issued, Basic	123,603,380	113,914,902	121,944,027	113,914,902
Average treasury shares (in shares)	(20,824,677)	(19,666,599)	(20,659,899)	(19,660,488)
Weighted Average Number of Shares, Deferred Compensation Plans	(55,859)	(55,713)	(55,840)	(55,698)
Average unearned nonvested shares	(192,792)	(172,350)	(171,856)	(149,408)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	102,530,052	94,020,240	101,056,432	94,049,308
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	173,818	169,779	169,071	168,749
Weighted Average Number Of Additional Shares Deferred Compensation Plan	56,396	55,751	56,396	55,751
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	102,760,266	94,245,770	101,281,899	94,273,808
Basic Earnings per Share (in dollars per share)	$ 0.42	$ 0.33	$ 0.72	$ 0.62
Diluted Earnings per Share (in dollars per share)	$ 0.42	$ 0.33	$ 0.72	$ 0.62