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Business Combinations - Additional Information (Detail) - CommScope, Inc. Subsidiaries Fiber Access Products, Technologies and Service Relationships [Member] - USD ($)
$ in Thousands
 3 Months Ended
Sep. 13, 2016
Mar. 31, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Date of acquisition   Sep. 13, 2016  
Business acquisition, description   On September 13, 2016, we acquired key fiber access products, technologies and service relationships from subsidiaries of CommScope, Inc. for $0.9 million in cash. This acquisition will enhance our solutions for the cable MSO industry and will provide cable operators with the scalable solutions, services and support they require to compete in the multi-gigabit service delivery market.  
Cash consideration $ 943    
Bargain purchase gain net of income taxes $ 3,542   $ 3,500
Acquisition and integration related expenses and amortization of acquired intangibles   $ 700