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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

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