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Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Earnings Per Share [Abstract] |  |  |  |
Weighted Average Share Earning (Loss) | 52,553 | 55,069 | 52,578 | 53,302
Weighted Average Shares, Contingently convertible debt |  | 3,534 |  | 8,563
Weighted Average Share, Stock compensation plans | 365 | 408 | 352 | 435
Weighted Average Shares, Diluted earnings (loss) and shares | 52,918 | 59,011 | 52,930 | 62,300
Income (loss) from continuing operations, Amount | $ 24,702 | $ 12,326 | $ 55,117 | $ 62,470
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units | (172) | (182) | (393) | (949)
Income (Loss) From Continuing Operations Basic | 24,530 | 12,144 | 54,724 | 61,521
Income (Loss) From Continuing Operations, Contingently convertible debt, Amount |  | 618 |  | 4,599
Income (Loss) From Continuing Operations Diluted, Amount | 24,530 | 12,762 | 54,724 | 66,120
Dilutive effect on earnings per share | (1,375) | (2,284) | (1,582) | (3,751)
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount | $ 0.47 | $ 0.22 | $ 1.04 | $ 1.15
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount | (1,375) | (2,284) | (1,582) | (3,751)
Income (Loss) From Continuing Operations Diluted, Per Share Amount | $ 0.46 | $ 0.22 | $ 1.03 | $ 1.06
Income (Loss) From Discontinued Operations, Contingently convertible debt, Amount |  | 2 |  | 82
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount | $ (0.03) | $ (0.04) | $ (0.03) | $ (0.07)
Income (Loss) From Discontinued Operations Diluted, Amount | (1,375) | (2,282) | (1,582) | (3,669)
Income (Loss) From Discontinued Operations Diluted, Per Share Amount | $ (0.02) | $ (0.04) | $ (0.03) | $ (0.06)
Net income (loss), Amount | 23,327 | 10,042 | 53,535 | 58,719
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units | (172) | (182) | (393) | (949)
Net Income (Loss), Amount | 23,155 | 9,860 | 53,142 | 57,770
Net Income (Loss), Contingently convertible debt, Amount |  | 620 |  | 4,681
Net Income (Loss) Diluted, Amount | $ 23,155 | $ 10,480 | $ 53,142 | $ 62,451
Net Income (Loss), Per Share Amount | $ 0.44 | $ 0.18 | $ 1.01 | $ 1.08
Net Income (Loss) Diluted, Per Share Amount | $ 0.44 | $ 0.18 | $ 1.00 | $ 1.00

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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=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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