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Acquisitions (Met-Pro) - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 27, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Acquisition related expenses included in pro-forma results   $ 17.7 $ 1.3 $ 13.9
Nonrecurring expenses included in pro-forma results   3.7 $ 26.6 3.5
Met-Pro [Member]        
Business Acquisition [Line Items]        
Cash consideration per share $ 13.75      
Stock consideration per share     $ 13.75  
Trading day period     15 days  
Exchange ratio 108.43%      
Percentage of common stock converted into cash     51.60%  
Value of shares transferred for cash     $ 104.4  
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  
Revenue from acquired entity   80.9 83.1 30.5
Income from acquired entity   $ 14.3 $ 14.6 $ 0.9
Met-Pro [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Exchange ratio 135.20%      
Met-Pro [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Exchange ratio 100.00%