Acquisition of Rivierawaves - Additional Information (Detail) - RivieraWaves - USD ($) $ in Thousands		9 Months Ended
	Jul. 04, 2014	Sep. 30, 2016
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Cost of acquired entity, purchase price	$ 18,378
Cost of acquired entity cash paid at closing	14,678
Business acquisition, description of contingent consideration arrangements		The remaining amount of $3,700 payable upon the satisfaction of certain milestones (the "Contingent Consideration")
Business acquisition, contingent consideration liability	3,700
Business acquisition, description of acquired entity		In addition, as part of the acquisition, the Company established an employee retention plan for the RivieraWaves employees at a cost of approximately $3,400, payable on a semi-annual basis for a period of two years after the Closing Date.
Employee retention plan cost	$ 3,400
Employee retention plan payment period	2 years