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Shareholders' Equity (Detail) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement of Stockholders' Equity [Abstract] |  |  |
Shares outstanding at beginning of year (in shares) | 44,368 | 44,248 | 43,959
Treasury shares issued for: |  |  |
Restricted stock awards (in shares) | 181 | 110 | 188
Employee stock options exercised (in shares) | 0 | 10 | 101
Shares outstanding at end of year (in shares) | 44,549 | 44,368 | 44,248

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