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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Weighted Average Number of Shares Issued, Basic 123,603,380 123,603,380 123,603,380 121,944,027
Average treasury shares (in shares) (21,304,610) (20,824,677) (21,365,195) (20,659,899)
Weighted Average Number of Shares, Deferred Compensation Plans (57,308) (55,859) (57,137) (55,840)
Average unearned nonvested shares (194,238) (192,792) (166,812) (171,856)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 102,047,224 102,530,052 102,014,236 101,056,432
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 182,749 173,818 166,628 169,071
Weighted Average Number Of Additional Shares Deferred Compensation Plan 57,625 56,396 57,625 56,396
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 102,287,598 102,760,266 102,238,489 101,281,899
Basic Earnings per Share (in dollars per share) $ 0.36 $ 0.42 $ 0.73 $ 0.72
Diluted Earnings per Share (in dollars per share) $ 0.36 $ 0.42 $ 0.73 $ 0.72