Annual report pursuant to Section 13 and 15(d)

Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail)

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Capital Structure and Per Share Data - Dilutive Effect on Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Weighted Average Share Earning (Loss)                 52,556 53,550 52,358
Weighted Average Shares, Contingently convertible debt                   6,411 12,517
Weighted Average Share, Stock compensation plans                 385 445 589
Weighted Average Shares, Diluted earnings (loss) and shares                 52,941 60,406 65,464
Income (loss) from continuing operations, Amount                 $ 84,678 $ 91,261 $ 81,531
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units                 (601) (1,381) (1,056)
Income (Loss) From Continuing Operations Basic                 84,077 89,880 80,475
Income (Loss) From Continuing Operations, Contingently convertible debt, Amount                   4,617 9,093
Income (Loss) From Continuing Operations Diluted, Amount                 84,077 94,497 89,568
Dilutive effect on earnings per share                 (3,060) (2,160) (5,277)
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount                 $ 1.60 $ 1.68 $ 1.54
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount                 (3,060) (2,160) (5,277)
Income (Loss) From Continuing Operations Diluted, Per Share Amount                 $ 1.59 $ 1.56 $ 1.37
Income (Loss) From Discontinued Operations, Contingently convertible debt, Amount                   64 207
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount                 $ (0.06) $ (0.04) $ (0.10)
Income (Loss) From Discontinued Operations Diluted, Amount                 (3,060) (2,096) (5,070)
Income (Loss) From Discontinued Operations Diluted, Per Share Amount                 $ (0.06) $ (0.03) $ (0.08)
Net income (loss), Amount 28,084 23,327 8,916 21,291 30,382 10,042 28,179 20,498 81,618 89,101 76,254
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units                 (601) (1,381) (1,056)
Net Income (Loss), Amount                 81,017 87,720 75,198
Net Income (Loss), Contingently convertible debt, Amount                   4,681 9,300
Net Income (Loss) Diluted, Amount                 $ 81,017 $ 92,401 $ 84,498
Net Income (Loss), Per Share Amount $ 0.53 $ 0.44 $ 0.17 $ 0.40 $ 0.55 $ 0.18 $ 0.53 $ 0.39 $ 1.54 $ 1.64 $ 1.44
Net Income (Loss) Diluted, Per Share Amount $ 0.53 $ 0.44 $ 0.17 $ 0.40 $ 0.55 $ 0.18 $ 0.47 $ 0.35 $ 1.53 $ 1.53 $ 1.29