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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator: |  |  |  |
Income from continuing operations | $ 18,006 | $ 13,595 | $ 72,185 | $ 62,526
Basic |  |  |  |
Weighted average common shares outstanding | 54,268 | 54,794 | 54,215 | 54,489
Diluted |  |  |  |
Stock options | 1,279 | 1,654 | 1,267 | 1,573
Restricted stock awards | 185 | 268 | 212 | 307
Contingent shares | 84 | 24 | 84 | 24
Diluted weighted average common shares outstanding | 55,816 | 56,740 | 55,778 | 56,393
Basic earnings per share from continuing operations | $ 0.33 | $ 0.25 | $ 1.33 | $ 1.15
Diluted earnings per share from continuing operations | $ 0.32 | $ 0.24 | $ 1.29 | $ 1.11

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