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Acquisition - Acquisition Acquired Activities (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
Earnings Per Share [Abstract]                      
Revenue, Consolidated As Reported $ 149,836 $ 168,779 $ 172,229 $ 201,189 $ 135,965 $ 149,312 $ 153,936 $ 187,325 $ 692,033 $ 626,538 $ 591,270
Revenue, Pro Forma Adjustments                   44,879  
Revenue, Pro Forma Consolidated                   671,417  
Net income (3,947) 62,360 9,147 18,303 1,206 5,307 5,848 18,785 85,863 31,146 28,007
Net income, Pro Forma Adjustments                   4,585  
Net income, Pro Forma Consolidated                   $ 35,731  
Earnings per share from continuing operations:                      
Basic, Consolidated As Reported $ (0.08) $ 1.28 $ 0.18 $ 0.37 $ 0.02 $ 0.11 $ 0.12 $ 0.38 $ 1.77 $ 0.63 $ 0.57
Basic, Pro Forma Adjustments                   $ 0.09  
Basic, Pro Forma Consolidated                   $ 0.72  
Diluted, Consolidated As Reported $ (0.08) $ 1.27 $ 0.18 $ 0.37 $ 0.02 $ 0.11 $ 0.12 $ 0.38 $ 1.75 $ 0.63 $ 0.56
Dilutes, Pro Forma Adjustments                   $ 0.09  
Diluted, Pro Forma Consolidated                   $ 0.72  
Weighted average common shares outstanding:                      
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
Basic, Weighted average common shares outstanding Pro Forma Adjustments                   435  
Basic, Weighted average common shares outstanding Pro Forma Consolidated                   49,437  
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
Diluted, Weighted average common shares outstanding Pro Forma Adjustments                   419  
Diluted, Weighted average common shares outstanding Pro Forma Consolidated                   49,671