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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 30, 2018
Jun. 30, 2019
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Goodwill       $ 7,000 $ 7,000  
Gain on contingency         1,230  
Bargain purchase gain net of income taxes           $ 11,322
SmartRG Inc [Member]            
Business Acquisition [Line Items]            
Business acquisition, agreement month and year       2018-11    
Business acquisition, description       In November 2018, we acquired SmartRG, Inc., for cash consideration. This transaction was accounted for as a business combination. We recorded goodwill of $3.5 million as a result of this acquisition, which represents the excess of the purchase price over the fair value of net assets acquired and liabilities assumed. The financial results of this acquisition are included in the consolidated financial statements since the date of acquisition. The revenues are included in the Subscriber Solutions & Experience category within the Network Solutions and Services & Support reportable segments.      
Goodwill $ 3,500          
Business combination, contingent consideration, liability 1,200          
Gain on contingency   $ 1,200        
Business combination escrow amount $ 2,800          
Business combination escrow fund released         1,300  
Sumitomo [Member]            
Business Acquisition [Line Items]            
Business acquisition, description       In March 2018, we acquired Sumitomo Electric Lightwave Corp.’s (SEL) North American EPON business and entered into a technology license and OEM supply agreement with Sumitomo Electric Industries, Ltd. (SEI).    
Date of acquisition       Mar. 31, 2018    
Bargain purchase gain net of income taxes     $ 11,300      
Smart RG and Sumitomo [Member]            
Business Acquisition [Line Items]            
Acquisition and integration related expenses and amortization of acquired intangibles       $ 3,800 $ 5,000 $ 2,900