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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Weighted Average Shares, Earning (loss) and shares 52,514 52,597 52,466 52,591
Weighted Average Shares, Stock compensation plans 416 345 472 346
Weighted Average Shares, Diluted earnings (loss) and shares 52,930 52,942 52,938 52,937
Income (Loss) From Continuing Operations, Amount $ 27,061 $ 8,717 $ 47,045 $ 30,415
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units (87) (63) (151) (229)
Income (Loss) From Continuing Operations, Basic 26,974 8,654 46,894 30,186
Income (Loss) From Continuing Operations Diluted, Amount 26,974 8,654 46,894 30,186
Income (Loss) From Continuing Operations, Basic earnings (loss), Per Share Amount $ 0.51 $ 0.16 $ 0.89 $ 0.57
Income (Loss) From Continuing Operations, Diluted earnings (loss), Per Share Amount $ 0.51 $ 0.16 $ 0.89 $ 0.57
Dilutive effect on earnings per share (68) 199 (666) (208)
Income (Loss) From Discontinued Operations, Basic earnings (loss), Amount (68) 199 (666) (208)
Income (Loss) From Discontinued Operations, Diluted earnings (loss), Amount (68) 199 (666) (208)
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   $ 0.01 $ (0.02)  
Net Income (Loss), Amount 26,993 8,916 46,379 30,207
Participating securities income (loss) from continuing operations non-vested restricted stock and stock units (87) (63) (151) (229)
Net Income (Loss), Basic, Amount 26,906 8,853 46,228 29,978
Net Income (Loss), Diluted, Amount $ 26,906 $ 8,853 $ 46,228 $ 29,978
Net Income (Loss), Basic, Per Share Amount $ 0.51 $ 0.17 $ 0.88 $ 0.57
Net Income (Loss), Diluted, Per Share Amount $ 0.51 $ 0.17 $ 0.87 $ 0.57