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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Met- Pro Corporation (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Goodwill $ 132,220 $ 19,548 $ 14,661
Met-Pro [Member]
     
Business Acquisition [Line Items]      
Current assets 69,117    
Property and equipment 16,393    
Other assets 1,375    
Assets held for sale 11,083    
Goodwill 104,884    
Intangible-finite life, net 35,810    
Intangible-indefinite life 11,910    
Total assets acquired 250,572    
Current liabilities assumed (13,678)    
Deferred income tax liability (28,244)    
Long term liabilities assumed (6,078)    
Net assets acquired $ 202,572