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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - HEE (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 13, 2014
Business Acquisition [Line Items]        
Goodwill $ 170,153 $ 220,163 $ 165,861  
HEE [Member]        
Business Acquisition [Line Items]        
Current assets       $ 913
Property and equipment       158
Goodwill       5,644
Intangible – finite life       2,690
Intangible – indefinite life       510
Total assets acquired       9,915
Current liabilities assumed       (415)
Net assets acquired       $ 9,500