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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Emtrol (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 03, 2014
Business Acquisition [Line Items]        
Goodwill $ 170,153 $ 220,163 $ 165,861  
Emtrol [Member]        
Business Acquisition [Line Items]        
Current assets       $ 9,922
Property and equipment       125
Goodwill       24,998
Intangible – finite life       12,890
Total assets acquired       47,935
Current liabilities assumed       (10,173)
Net assets acquired       $ 37,762