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Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Earnings Per Share [Abstract] |  |  |  |
Weighted Average Shares, Basic | 44,570 | 45,731 | 44,680 | 46,340
Weighted Average Shares, Stock compensation plans | 240 | 193 | 296 | 183
Weighted Average Shares, Diluted | 44,810 | 45,924 | 44,976 | 46,523
Income (Loss) From Continuing Operations, Amount | $ 12,314 | $ 23,043 | $ 12,294 | $ 37,507
Participating securities income (loss) from continuing operations non-vested restricted stock | (9) | (13) | (9) | (21)
Income (Loss) From Continuing Operations, Basic, Amount | 12,305 | 23,030 | 12,285 | 37,486
Income (Loss) From Continuing Operations Diluted, Amount | $ 12,305 | $ 23,030 | $ 12,285 | $ 37,486
Income (Loss) From Continuing Operations, Basic, Per Share Amount | $ 0.28 | $ 0.50 | $ 0.27 | $ 0.81
Income (Loss) From Continuing Operations, Diluted, Per Share Amount | $ 0.27 | $ 0.50 | $ 0.27 | $ 0.81
Income (Loss) From Discontinued Operations, Earnings (loss), Amount | $ (182) | $ (221) | $ (703) | $ (61)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount | (182) | (221) | (703) | (61)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount | $ (182) | (221) | $ (703) | $ (61)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Per Share Amount | $ (0.01) |  | $ (0.01) |
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount |  |  | $ (0.01) | $ (0.01)
Net Income (Loss), Amount | $ 12,132 | 22,822 | $ 11,591 | $ 37,446
Participating securities net income (loss) non-vested restricted stock | (9) | (13) | (9) | (21)
Net Income (Loss), Basic, Amount | 12,123 | 22,809 | 11,582 | 37,425
Net Income (Loss), Diluted, Amount | $ 12,123 | $ 22,809 | $ 11,582 | $ 37,425
Net Income (Loss), Basic, Per Share Amount | $ 0.27 | $ 0.50 | $ 0.26 | $ 0.81
Net Income (Loss), Diluted, Per Share Amount | $ 0.27 | $ 0.50 | $ 0.26 | $ 0.80

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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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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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Period Type: | duration