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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
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |  |  |
Weighted Average Number of Shares Issued, Basic | 113,914,902 | 113,914,902 | 113,914,902 | 113,914,902
Average treasury shares (in shares) | (17,695,829) | (15,788,359) | (17,707,057) | (15,730,604)
Weighted Average Number of Shares, Deferred Compensation Plans | (55,582) | (41,426) | (55,563) | (39,939)
Average unearned nonvested shares | (150,663) | (152,784) | (132,474) | (116,379)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share (in shares) | 96,012,828 | 97,932,333 | 96,019,808 | 98,027,980
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share | 213,982 | 173,095 | 180,052 | 185,023
Weighted Average Number Of Additional Shares Deferred Compensation Plan | 55,615 | 41,426 | 55,615 | 41,426
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) | 96,282,425 | 98,146,854 | 96,255,475 | 98,254,429
Basic Earnings per Share (in dollars per share) | $ 0.31 | $ 0.24 | $ 0.72 | $ 0.29
Diluted Earnings per Share (in dollars per share) | $ 0.31 | $ 0.24 | $ 0.72 | $ 0.29

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