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Business Segment Information - Net Sales by Business Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net Sales by Business Segment        
Net sales $ 49,796 $ 33,102 $ 128,590 $ 100,720
Engineered Equipment Technology and Parts [Member]
       
Net Sales by Business Segment        
Net sales 32,646 22,240 91,216 65,355
Engineered Equipment Technology and Parts [Member] | United States [Member]
       
Net Sales by Business Segment        
Net sales 21,741 18,425 64,444 55,889
Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
       
Net Sales by Business Segment        
Net sales 7,510   17,904  
Engineered Equipment Technology and Parts [Member] | Canada [Member]
       
Net Sales by Business Segment        
Net sales 842 1,855 3,304 5,883
Engineered Equipment Technology and Parts [Member] | China [Member]
       
Net Sales by Business Segment        
Net sales 2,553 1,787 5,564 3,289
Engineered Equipment Technology and Parts [Member] | Brazil [Member]
       
Net Sales by Business Segment        
Net sales   0   121
Engineered Equipment Technology and Parts [Member] | India [Member]
       
Net Sales by Business Segment        
Net sales   173   173
Met-Pro [Member]
       
Net Sales by Business Segment        
Net sales 7,273   7,273  
Contracting / Services [Member]
       
Net Sales by Business Segment        
Net sales 4,412 5,644 13,507 19,472
Component Parts [Member]
       
Net Sales by Business Segment        
Net sales 5,664 5,238 16,497 15,854
Corporate [Member]
       
Net Sales by Business Segment        
Net sales $ (199) $ (20) $ 97 $ 39