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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - Emtrol (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 169,324 $ 167,547 $ 134,062
Emtrol [Member]      
Business Acquisition [Line Items]      
Current assets 9,922    
Property and equipment 125    
Goodwill 24,998    
Intangible - finite life, net 12,890    
Total assets acquired 47,935    
Current liabilities assumed (10,173)    
Net assets acquired $ 37,762