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Acquisitions - Additional Information (Detail)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Sep. 30, 2014
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Sep. 30, 2014
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
EUR (€)
Dec. 31, 2013
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Aug. 13, 2014
HEE Environmental Engineering, LLC ("HEE") [Member]
USD ($)
Sep. 26, 2014
SAT Technology, Inc. ("SAT") [Member]
USD ($)
Aug. 27, 2013
Met-Pro [Member]
USD ($)
Mar. 31, 2013
Met-Pro [Member]
USD ($)
Sep. 30, 2014
Met-Pro [Member]
USD ($)
Aug. 27, 2013
Met-Pro [Member]
Maximum [Member]
Aug. 27, 2013
Met-Pro [Member]
Minimum [Member]
Mar. 31, 2013
Met-Pro [Member]
Minimum [Member]
Business Acquisition [Line Items]                            
Business combination contingent consideration paid       $ 5,200,000 € 4,000,000   $ 9,500,000 $ 2,400,000            
Cash paid on acquisition       24,400,000     7,000,000 1,400,000            
Earn out expenses 300,000 900,000 400,000 1,100,000     2,000,000 1,000,000            
Company's common stock       763,673     34,626              
Fair value of common stock issued       6,800,000     500,000              
Prepaid compensation recognized in Prepaid expenses and other current assets       1,000,000   1,100,000                
Prepaid compensation recognized in Deferred Charges and other assets       2,500,000   3,500,000                
Business combination compensation expenses 300,000 500,000 200,000 800,000                    
Earn out payment upon attainment of specified financial targets through December 31, 2017       7,200,000 5,500,000                  
Earn out expenses included in accounts payable and accrued expenses       800,000   1,300,000                
Cash consideration per share                 $ 13.75          
Stock consideration per share                   $ 13.75        
Exchange ratio                 1.0843     1.3520 1.0000 1.0000
Percentage of common stock converted into cash                     51.60%      
Value of shares transferred for cash                     104,400,000      
Trading day period                     15 days      
Trading price                     $ 12.6814      
Shares of common stock in aggregate stock consideration                     7,726,235      
Percentage of cash consideration                     77.56%      
Percentage of stock consideration                     22.44%      
Value of stock recorded                     98,000,000      
Consideration for cancelling of options and restricted stock units                     $ 4,900,000