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Business Combinations - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 30, 2018
Mar. 19, 2018
Jun. 30, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Gain on contingency         $ 1,230,000    
Goodwill         $ 7,000,000.0 $ 7,100,000  
Bargain purchase gain net of income taxes           11,322,000  
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., a provider of carrier-class, open-source connected home platforms and cloud services for broadband service providers for cash consideration. This transaction was accounted for as a business combination. We have included the financial results of this acquisition in our consolidated financial statements since the date of acquisition. These revenues are included in the Subscriber Solutions & Experience category within the Network Solutions and Services & Support reportable segments.      
Business combination, contingent consideration, liability $ 1,200,000            
Gain on contingency     $ 1,200,000        
Business combination escrow amount 2,800,000            
Business combination escrow fund released         $ 1,300,000    
Goodwill 3,500,000            
SmartRG Inc [Member] | Minimum [Member]              
Business Acquisition [Line Items]              
Business combination potential release of funds 0            
SmartRG Inc [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Business combination potential release of funds $ 1,500,000            
Sumitomo [Member]              
Business Acquisition [Line Items]              
Business acquisition, description         On March 19, 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. 19, 2018    
Bargain purchase gain net of income taxes   $ 11,322,000   $ 11,300,000      
Smart RG and Sumitomo [Member]              
Business Acquisition [Line Items]              
Acquisition and integration related expenses and amortization of acquired intangibles         $ 5,000,000.0 $ 2,900,000 $ 0