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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Earnings Per Share [Abstract] |  |  |  |
Weighted Average Number of Shares Issued, Basic | 123,603,380 | 113,914,902 | 122,503,223 | 113,914,902
Average treasury shares (in shares) | (21,222,298) | (20,485,573) | (20,849,426) | (19,938,539)
Weighted Average Number of Shares, Deferred Compensation Plans | (56,402) | (55,751) | (56,029) | (55,716)
Average unearned nonvested shares | (165,467) | (178,724) | (169,703) | (159,287)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares) | 102,159,213 | 93,194,854 | 101,428,065 | 93,761,360
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share | 226,939 | 199,620 | 190,178 | 177,013
Weighted Average Number Of Additional Shares Deferred Compensation Plan | 56,726 | 55,785 | 56,727 | 55,785
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) | 102,442,878 | 93,450,259 | 101,674,970 | 93,994,158
Basic Earnings per Share (in dollars per share) | $ 0.38 | $ 0.36 | $ 1.11 | $ 0.99
Diluted Earnings per Share (in dollars per share) | $ 0.38 | $ 0.36 | $ 1.10 | $ 0.98

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