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
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Weighted Average Shares, Earning (loss) and shares 52,418 52,586
Weighted Average Shares, Stock compensation plans 528 345
Weighted Average Shares, Diluted earnings (loss) and shares 52,946 52,931
Income (Loss) From Continuing Operations, Amount $ 19,984 $ 21,697
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units (63) (170)
Income (Loss) From Continuing Operations, Basic 19,921 21,527
Income (Loss) From Continuing Operations Diluted, Amount 19,921 21,527
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount $ 0.38 $ 0.41
Income (Loss) From Continuing Operations, Diluted earnings (loss), Per Share Amount $ 0.38 $ 0.41
Dilutive effect on earnings per share (598) (406)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount (598) (406)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount (598) (406)
Income (Loss) From Discontinuing Operations, Basic earnings (loss), Per Share Amount $ (0.01) $ (0.01)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Per Share Amount $ (0.02) $ (0.01)
Net Income (Loss), Amount 19,386 21,291
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units (63) (170)
Net Income (Loss), Basic, Amount 19,323 21,121
Net Income (Loss), Diluted, Amount $ 19,323 $ 21,121
Net Income (Loss), Basic, Per Share Amount $ 0.37 $ 0.40
Net Income (Loss), Diluted, Per Share Amount $ 0.36 $ 0.40