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Acquisition - Summary of Initial Purchase Price Allocation for Company's Acquisition of Headway (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Apr. 04, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 69,042   $ 50,081
Headway      
Business Acquisition [Line Items]      
Accounts receivable   $ 20,100  
Intangible assets subject to amortization   17,100  
Goodwill   18,900  
Current liabilities   (24,000)  
Deferred Tax   $ (6,600)