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Acquisition - Additional Information (Detail)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Aug. 27, 2013
Met-Pro [Member]
Sep. 30, 2013
Met-Pro [Member]
USD ($)
Sep. 30, 2013
Met-Pro [Member]
Maximum [Member]
Sep. 30, 2013
Met-Pro [Member]
Minimum [Member]
Sep. 30, 2013
Aarding Thermal Acoustics [Member]
USD ($)
Sep. 30, 2013
Aarding Thermal Acoustics [Member]
USD ($)
Sep. 30, 2013
Aarding Thermal Acoustics [Member]
EUR (€)
Business Acquisition [Line Items]              
Cash paid on acquisition           $ 24.4  
Company's common stock           763,673 763,673
Fair value of common stock issued         7.4 7.4  
Business combination contingent consideration paid         5.4 5.4 4.0
Prepaid compensation recognized in Prepaid expenses and other current assets         1.1 1.1  
Prepaid compensation recognized in Deferred Charges and other assets         3.7 3.7  
Business combination compensation expenses         0.2 0.5  
Earn out payment upon attainment of gross profit           7.4 5.5
Earn out expenses         0.4 0.9  
Earn out expenses included in accounts payable and accrued expenses         0.9 0.9  
Agreement and plan of merger, date Apr. 21, 2013            
Merger agreement, amended date Aug. 05, 2013            
Cash consideration per share   $ 13.75          
Stock consideration per share   $ 13.75          
Exchange ratio   1.0843 1.3520 1.0000      
Percentage of common stock converted into cash   51.60%          
Value of Shares transferred for Cash   104.4          
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   98.0          
Consideration for cancelling of options and restricted stock units   $ 4.9