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Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted Average Shares, Basic |  |  |  |  |  |  |  |  | 43,997 | 45,637 | 50,489
Weighted Average Shares, Stock compensation plans |  |  |  |  |  |  |  |  | 361 | 311 | 394
Weighted Average Shares, Diluted |  |  |  |  |  |  |  |  | 44,358 | 45,948 | 50,883
Income (Loss) From Continuing Operations, Amount |  |  |  |  |  |  |  |  | $ 94,153 | $ 94,516 | $ 88,091
Participating securities income (loss) from continuing operations non-vested restricted stock and restricted stock units |  |  |  |  |  |  |  |  | (85) | (52) | (36)
Income (Loss) From Continuing Operations, Basic, Amount |  |  |  |  |  |  |  |  | 94,068 | 94,464 | 88,055
Income (Loss) From Continuing Operations Diluted, Amount |  |  |  |  |  |  |  |  | $ 94,068 | $ 94,464 | $ 88,055
Income (Loss) From Continuing Operations, Basic, Per Share Amount |  |  |  |  |  |  |  |  | $ 2.14 | $ 2.07 | $ 1.74
Income (Loss) From Continuing Operations, Diluted, Per Share Amount |  |  |  |  |  |  |  |  | $ 2.12 | $ 2.06 | $ 1.73
Income (Loss) From Discontinued Operations, Earnings (loss), Amount |  |  |  |  |  |  |  |  | $ (1,170) | $ (1,323) | $ (1,780)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount |  |  |  |  |  |  |  |  | (1,170) | (1,323) | (1,780)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount |  |  |  |  |  |  |  |  | $ (1,170) | $ (1,323) | $ (1,780)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ (0.03) | $ (0.03) | $ (0.03)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount |  |  |  |  |  |  |  |  | $ (0.03) | $ (0.03) | $ (0.03)
Net Income (Loss), Amount | $ 61,952 | $ 19,440 | $ 12,132 | $ (541) | $ 37,636 | $ 18,111 | $ 22,822 | $ 14,624 | $ 92,983 | $ 93,193 | $ 86,311
Participating securities net income (loss) non-vested restricted stock and restricted stock units |  |  |  |  |  |  |  |  | (85) | (52) | (36)
Net Income (Loss), Basic, Amount |  |  |  |  |  |  |  |  | 92,898 | 93,141 | 86,275
Net Income (Loss), Diluted, Amount |  |  |  |  |  |  |  |  | $ 92,898 | $ 93,141 | $ 86,275
Net Income (Loss), Basic, Per Share Amount | $ 1.43 | $ 0.45 | $ 0.27 | $ (0.01) | $ 0.84 | $ 0.40 | $ 0.50 | $ 0.31 | $ 2.11 | $ 2.04 | $ 1.71
Net Income (Loss), Diluted, Per Share Amount | $ 1.42 | $ 0.44 | $ 0.27 | $ (0.01) | $ 0.83 | $ 0.40 | $ 0.50 | $ 0.31 | $ 2.09 | $ 2.03 | $ 1.70

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- Definition The amount of net income (loss) derived from continuing operations during the period available used in the calculation of basic earnings (loss) per share after consideration of the effect of participating securities under the two-class method related non-vested restricted stock and restricted stock units that contain rights to receive non-forfeitable dividends, and thus, are considered participating securities. + References No definition available. + Details
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