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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share from Continuing Operations (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
Numerator:                      
Income from continuing operations $ (3,228) $ 5,476 $ 5,620 $ 17,121 $ (1,416) $ 3,019 $ 3,864 $ 17,285 $ 24,989 $ 22,752 $ 19,139
Basic                      
Weighted average common shares outstanding 46,981 48,504 49,639 49,417 48,967 48,895 49,041 49,103 48,632 49,002 49,328
Diluted                      
Stock Options                 194   61
Restricted stock awards                 263 186 179
Contingent shares                 52 64 31
Diluted weighted average common shares outstanding 46,981 49,003 49,929 49,836 48,967 49,109 49,244 49,531 49,141 49,252 49,599
Basic earnings per share from continuing operations $ (0.07) $ 0.11 $ 0.11 $ 0.35 $ (0.03) $ 0.06 $ 0.08 $ 0.35 $ 0.51 $ 0.46 $ 0.39
Diluted earnings per share from continuing operations $ (0.07) $ 0.11 $ 0.11 $ 0.34 $ (0.03) $ 0.06 $ 0.08 $ 0.35 $ 0.51 $ 0.46 $ 0.39