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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Net sales to outside customers $ 197,317 $ 135,052
Engineered Equipment Technology and Parts [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 125,248 88,679
Engineered Equipment Technology and Parts [Member] | United States [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 88,170 75,824
Engineered Equipment Technology and Parts [Member] | Canada [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 3,557 7,611
Engineered Equipment Technology and Parts [Member] | China [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 7,763 4,905
Engineered Equipment Technology and Parts [Member] | Brazil [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 170 121
Engineered Equipment Technology and Parts [Member] | India [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers   218
Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 25,588  
Contracting / Services [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 19,500 25,527
Component Parts [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 21,908 20,771
Corporate and other [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 135 75
Met-Pro [Member]
   
Segment Reporting Information [Line Items]    
Net sales to outside customers 30,526  
Operating Segments [Member]
   
Segment Reporting Information [Line Items]    
Total sales 208,053 142,256
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member]
   
Segment Reporting Information [Line Items]    
Total sales 131,296 92,301
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member]
   
Segment Reporting Information [Line Items]    
Total sales 90,509 77,447
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member]
   
Segment Reporting Information [Line Items]    
Total sales 5,160 7,548
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | China [Member]
   
Segment Reporting Information [Line Items]    
Total sales 9,530 6,967
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member]
   
Segment Reporting Information [Line Items]    
Total sales 170 121
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | India [Member]
   
Segment Reporting Information [Line Items]    
Total sales   218
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
   
Segment Reporting Information [Line Items]    
Total sales 25,927  
Operating Segments [Member] | Contracting / Services [Member]
   
Segment Reporting Information [Line Items]    
Total sales 21,835 27,852
Operating Segments [Member] | Component Parts [Member]
   
Segment Reporting Information [Line Items]    
Total sales 23,253 22,084
Operating Segments [Member] | Corporate and other [Member]
   
Segment Reporting Information [Line Items]    
Total sales    19
Operating Segments [Member] | Met-Pro [Member]
   
Segment Reporting Information [Line Items]    
Total sales 31,669  
Intra-segment [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (7,245) (3,277)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (5,115) (2,828)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (1,406) (829)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (1,603) 63
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | China [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (1,767) (2,062)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales      
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | India [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales     
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (339)  
Intra-segment [Member] | Contracting / Services [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (464) (83)
Intra-segment [Member] | Component Parts [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (523) (366)
Intra-segment [Member] | Corporate and other [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales      
Intra-segment [Member] | Met-Pro [Member]
   
Segment Reporting Information [Line Items]    
Less intra-segment sales (1,143)  
Inter-segment Elimination [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment (1,806) (2,269)
Inter-segment Sales Purchases by Met-Pro segment (254)  
Inter-segment Sales Purchases by Contracting or Services Segment (1,484) (1,724)
Inter-segment Sales Purchases by Component Parts Segment (82)   
Inter-segment Sales Purchases by Corporate and other 135 66
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment      
Inter-segment Sales Purchases by Met-Pro segment (248)  
Inter-segment Sales Purchases by Contracting or Services Segment (685) (794)
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment      
Inter-segment Sales Purchases by Met-Pro segment (248)  
Inter-segment Sales Purchases by Contracting or Services Segment (685) (794)
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment      
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment      
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | China [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment      
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment      
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment      
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment      
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | India [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment     
Inter-segment Sales Purchases by Contracting or Services Segment     
Inter-segment Sales Purchases by Component Parts Segment     
Inter-segment Sales Purchases by Corporate and other     
Inter-segment Elimination [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment     
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment     
Inter-segment Sales Purchases by Component Parts Segment     
Inter-segment Sales Purchases by Corporate and other     
Inter-segment Elimination [Member] | Contracting / Services [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment (1,785) (2,242)
Inter-segment Sales Purchases by Met-Pro segment (4)  
Inter-segment Sales Purchases by Contracting or Services Segment      
Inter-segment Sales Purchases by Component Parts Segment (82)   
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Component Parts [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment (21) (27)
Inter-segment Sales Purchases by Met-Pro segment (2)  
Inter-segment Sales Purchases by Contracting or Services Segment (799) (920)
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other      
Inter-segment Elimination [Member] | Corporate and other [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment     
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment    (10)
Inter-segment Sales Purchases by Component Parts Segment      
Inter-segment Sales Purchases by Corporate and other 135 66
Inter-segment Elimination [Member] | Met-Pro [Member]
   
Segment Reporting Information [Line Items]    
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment     
Inter-segment Sales Purchases by Met-Pro segment     
Inter-segment Sales Purchases by Contracting or Services Segment     
Inter-segment Sales Purchases by Component Parts Segment     
Inter-segment Sales Purchases by Corporate and other