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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Weighted Average Number of Shares Issued, Basic	125,612,097	123,603,380	124,613,288	123,603,380
Average treasury shares (in shares)	(21,656,080)	(21,304,610)	(21,700,837)	(21,365,195)
Weighted Average Number of Shares, Deferred Compensation Plans	(56,581)	(57,308)	(56,562)	(57,137)
Average unearned nonvested shares	(271,044)	(194,238)	(252,952)	(166,812)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	103,628,392	102,047,224	102,602,937	102,014,236
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	243,412	182,749	226,784	166,628
Weighted Average Number Of Additional Shares Deferred Compensation Plan	56,624	57,625	56,624	57,625
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	103,928,428	102,287,598	102,886,345	102,238,489
Basic Earnings per Share (in dollars per share)	$ 0.32	$ 0.36	$ 0.64	$ 0.73
Diluted Earnings per Share (in dollars per share)	$ 0.32	$ 0.36	$ 0.64	$ 0.73