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Business Segment Information - Intra-Segment and Inter-Segment Revenues (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
Segment Reporting Information [Line Items]        
Net sales to outside customers $ 49,796 $ 33,102 $ 128,590 $ 100,720
Engineered Equipment Technology and Parts [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 32,646 22,240 91,216 65,355
Engineered Equipment Technology and Parts [Member] | United States [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 21,741 18,425 64,444 55,889
Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 7,510   17,904  
Engineered Equipment Technology and Parts [Member] | China [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 2,553 1,787 5,564 3,289
Engineered Equipment Technology and Parts [Member] | Canada [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 842 1,855 3,304 5,883
Engineered Equipment Technology and Parts [Member] | Brazil [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers   0   121
Engineered Equipment Technology and Parts [Member] | India [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers   173   173
Met-Pro [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 7,273   7,273  
Contracting / Services [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 4,412 5,644 13,507 19,472
Component Parts [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers 5,664 5,238 16,497 15,854
Corporate and other [Member]
       
Segment Reporting Information [Line Items]        
Net sales to outside customers (199) (20) 97 39
Operating Segments [Member]
       
Segment Reporting Information [Line Items]        
Total sales 52,694 34,669 136,047 105,939
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member]
       
Segment Reporting Information [Line Items]        
Total sales 34,123 22,979 95,580 68,539
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member]
       
Segment Reporting Information [Line Items]        
Total sales 22,519 18,775 66,473 57,202
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
       
Segment Reporting Information [Line Items]        
Total sales 7,405   17,799  
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | China [Member]
       
Segment Reporting Information [Line Items]        
Total sales 2,696 2,166 6,672 5,223
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member]
       
Segment Reporting Information [Line Items]        
Total sales 1,503 1,865 4,636 5,820
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member]
       
Segment Reporting Information [Line Items]        
Total sales        121
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | India [Member]
       
Segment Reporting Information [Line Items]        
Total sales   173   173
Operating Segments [Member] | Met-Pro [Member]
       
Segment Reporting Information [Line Items]        
Total sales 7,559   7,559  
Operating Segments [Member] | Contracting / Services [Member]
       
Segment Reporting Information [Line Items]        
Total sales 5,018 6,166 15,383 20,577
Operating Segments [Member] | Component Parts [Member]
       
Segment Reporting Information [Line Items]        
Total sales 5,994 5,524 17,525 16,804
Operating Segments [Member] | Corporate and other [Member]
       
Segment Reporting Information [Line Items]        
Total sales    0   19
Intra-segment [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (1,941) (832) (4,829) (2,862)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (1,315) (723) (3,726) (2,558)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (616) (334) (1,391) (687)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales 105   105  
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | China [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (143) (379) (1,108) (1,934)
Intra-segment [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (661) (10) (1,332) 63
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] | Met-Pro [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (286)   (286)  
Intra-segment [Member] | Contracting / Services [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (205) (20) (412) (68)
Intra-segment [Member] | Component Parts [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales (135) (89) (405) (236)
Intra-segment [Member] | Corporate and other [Member]
       
Segment Reporting Information [Line Items]        
Less intra-segment sales           
Inter-segment Elimination [Member]
       
Segment Reporting Information [Line Items]        
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment (332) (505) (1,408) (1,058)
Inter-segment Sales Purchases by Contracting or Services Segment (353) (210) (1,244) (1,329)
Inter-segment Sales Purchases by Component Parts Segment (73)    (73)   
Inter-segment Sales Purchases by Corporate and other (199) (20) 97 30
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 Contracting or Services Segment (162) (16) (638) (626)
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 Contracting or Services Segment (162) (16) (638) (626)
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 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 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] | Canada [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] | Brazil [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] | 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] | Met-Pro [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] | Contracting / Services [Member]
       
Segment Reporting Information [Line Items]        
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment (328) (502) (1,391) (1,037)
Inter-segment Sales Purchases by Contracting or Services Segment           
Inter-segment Sales Purchases by Component Parts Segment (73)    (73)   
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 (4) (3) (17) (21)
Inter-segment Sales Purchases by Contracting or Services Segment (191) (194) (606) (693)
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 Contracting or Services Segment         (10)
Inter-segment Sales Purchases by Component Parts Segment           
Inter-segment Sales Purchases by Corporate and other $ (199) $ (20) $ 97 $ 30