Quarterly report pursuant to Section 13 or 15(d)

Per Share Data and Stockholders' Equity - Dilutive Effect on Earnings Per Share (Detail)

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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
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