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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Weighted Average Number of Shares Issued, Basic 123,603,380 123,603,380 123,603,380 122,503,223
Average treasury shares (in shares) (21,238,907) (21,222,298) (21,322,792) (20,849,426)
Weighted Average Number of Shares, Deferred Compensation Plans (57,617) (56,402) (57,298) (56,029)
Average unearned nonvested shares (237,623) (165,467) (190,588) (169,703)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 102,069,233 102,159,213 102,032,702 101,428,065
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 292,820 226,939 203,600 190,178
Weighted Average Number Of Additional Shares Deferred Compensation Plan 56,911 56,726 56,911 56,727
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 102,418,964 102,442,878 102,293,213 101,674,970
Basic Earnings per Share (in dollars per share) $ 0.31 $ 0.38 $ 1.05 $ 1.11
Diluted Earnings per Share (in dollars per share) $ 0.31 $ 0.38 $ 1.04 $ 1.10