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Acquisition of Rivierawaves - Additional Information (Detail) - RivieraWaves - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Jul. 04, 2014
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
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      
Contingent consideration paid     $ 1,000 $ 2,700  
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, to be payable on a semi-annual basis for a period of two years after the Closing Date.
Employee retention plan cost   $ 3,400      
Payment for employee retention $ 971        
Employee retention plan payment period   2 years