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Acquisitions - Fair Values of Assets and Liabilities Assumed at Date of Closing after Company Finalized Purchase Accounting - PMFG (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 170,153 $ 220,163 $ 165,861
PMFG, Inc. [Member]      
Business Acquisition [Line Items]      
Current assets (including cash of $27,100) 92,293    
Property and equipment 24,787    
Other assets 953    
Assets held for sale 950    
Goodwill 59,860    
Intangible – finite life 29,940    
Intangible – indefinite life 10,280    
Total assets acquired 219,063    
Current liabilities assumed (73,364)    
Deferred income tax liability (800)    
Long term liabilities assumed (3,961)    
Noncontrolling interest (4,212)    
Net assets acquired $ 136,726