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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
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]      
Goodwill $ 134,001 $ 132,220 $ 19,548
Met-Pro [Member]
     
Business Acquisition [Line Items]      
Current assets 68,766    
Property and equipment 15,773    
Other assets 1,375    
Assets held for sale 10,886    
Goodwill 106,726    
Intangible assets - finite life 35,810    
Intangible assets - indefinite life 11,910    
Total assets acquired 251,246    
Current liabilities assumed (13,638)    
Deferred income tax liability (28,958)    
Long term liabilities assumed (6,078)    
Net assets acquired $ 202,572