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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
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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

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the 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 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + 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=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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