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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - HEE (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Aug. 13, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 232,240 $ 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