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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - HEE (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 169,324 $ 167,547 $ 134,062
HEE [Member]      
Business Acquisition [Line Items]      
Current assets 913    
Property and equipment 158    
Goodwill 5,644    
Intangible - finite life, net 2,690    
Intangible - indefinite life 510    
Total assets acquired 9,915    
Current liabilities assumed (415)    
Net assets acquired $ 9,500