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Acquisitions - Fair Values of Assets and Liabilities Assumed at Date of Closing - PMFG (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 232,240 $ 167,547 $ 134,062
PMFG, Inc. [Member]      
Business Acquisition [Line Items]      
Current assets (including cash of $27,450) 93,342    
Property and equipment 31,129    
Other assets 984    
Assets held for sale 950    
Deferred income tax asset 1,865    
Goodwill 63,270    
Intangible - finite life, net 34,900    
Intangible - indefinite life 10,750    
Total assets acquired 237,190    
Current liabilities assumed (73,447)    
Deferred income tax liability (18,195)    
Long term liabilities assumed (2,822)    
Noncontrolling interest (6,000)    
Net assets acquired $ 136,726