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Acquisition - Schedule of Restricted Stock Unit Activity Table (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Business Acquisition [Line Items]    
Deferred income tax liability $ (34,892) $ (128)
Met-Pro [Member]
    
Business Acquisition [Line Items]    
Current assets 69,344  
Property and equipment 17,038  
Other assets 4,862  
Assets held for sale 8,723  
Goodwill 105,429  
Intangible - finite life, net 35,810  
Intangible - indefinite life 11,910  
Total assets acquired 253,116  
Current liabilities assumed (13,588)  
Deferred income tax liability (27,598)  
Long term liabilities assumed (5,969)  
Net assets acquired $ 205,961