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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Met-Pro Corporation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 27, 2013
Business Acquisition [Line Items]        
Goodwill $ 220,163 $ 165,861 $ 129,888  
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       102,552
Intangible – finite life       35,810
Intangible – indefinite life       11,910
Total assets acquired       247,072
Current liabilities assumed       (13,638)
Deferred income tax liability       (24,784)
Long term liabilities assumed       (6,078)
Net assets acquired       $ 202,572