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Acquisitions - Additional Information (Detail)
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2014
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Mar. 31, 2013
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Mar. 31, 2014
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
EUR (€)
Dec. 31, 2013
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
USD ($)
Aug. 27, 2013
Met-Pro [Member]
USD ($)
Mar. 31, 2014
Met-Pro [Member]
USD ($)
Mar. 31, 2013
Met-Pro [Member]
USD ($)
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]                        
Cash paid on acquisition     $ 24,400,000                  
Company's common stock     763,673                  
Fair value of common stock issued     6,800,000                  
Business combination contingent consideration paid     5,500,000   4,000,000              
Prepaid compensation recognized in Prepaid expenses and other current assets     1,100,000     1,100,000            
Prepaid compensation recognized in Deferred Charges and other assets     3,200,000     3,500,000            
Business combination compensation expenses     300,000 100,000                
Earn out payment upon attainment of specified financial targets through December 31, 2017     7,600,000   5,500,000              
Earn out expenses     400,000 100,000                
Earn out expenses included in accounts payable and accrued expenses     1,600,000     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        
Proceeds from sale of assets held for sale 4,500,000                      
Proceeds from sale of assets held for sale, closing balance $ 6,356,000 $ 11,083,000