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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Weighted Average Shares, Earning (loss) and shares 52,070 52,553 52,333 52,578
Weighted Average Shares, Stock compensation plans 483 365 475 352
Weighted Average Shares, Diluted earnings (loss) and shares 52,553 52,918 52,808 52,930
Income (Loss) From Continuing Operations, Amount $ 24,557 $ 24,702 $ 71,602 $ 55,117
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units (79) (172) (229) (393)
Income (Loss) From Continuing Operations, Basic 24,478 24,530 71,373 54,724
Income (Loss) From Continuing Operations Diluted, Amount 24,478 24,530 71,373 54,724
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount $ 0.47 $ 0.47 $ 1.36 $ 1.04
Income (Loss) From Continuing Operations, Diluted earnings (loss), Per Share Amount $ 0.47 $ 0.46 $ 1.35 $ 1.03
Dilutive effect on earnings per share 155 (1,375) (511) (1,582)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount 155 (1,375) (511) (1,582)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount 155 (1,375) (511) (1,582)
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount   $ (0.03) $ (0.01) $ (0.03)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount   $ (0.02) $ (0.01) $ (0.03)
Net Income (Loss), Amount 24,712 23,327 71,091 53,535
Net Income (Loss), Basic, Amount 24,633 23,155 70,862 53,142
Net Income (Loss), Diluted, Amount $ 24,633 $ 23,155 $ 70,862 $ 53,142
Net Income (Loss), Basic, Per Share Amount $ 0.47 $ 0.44 $ 1.35 $ 1.01
Net Income (Loss), Diluted, Per Share Amount $ 0.47 $ 0.44 $ 1.34 $ 1.00