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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 30, 2018
Mar. 19, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill       $ 7,100 $ 3,500  
Bargain purchase gain net of income taxes       11,322   $ 3,542
Acquisition and integration related expenses and amortization of acquired intangibles       $ 2,900    
SmartRG Inc [Member]            
Business Acquisition [Line Items]            
Date of acquisition       Nov. 30, 2018    
Business acquisition, description       On November 30, 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. Together, ADTRAN Mosaic and SmartOS provide full end-to-end management and orchestration solutions from cloud edge to subscriber edge. 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.   As of the acquisition date, we acquired accounts receivables with a fair value of $4.9 million all of which we estimate will be collected under the respective terms of each agreement.    
Acquired Accounts Receivables $ 4,900          
Business combination, contingent consideration, liability 1,200     $ 1,200    
Minimum potential payment under contingent liability 0          
Maximum potential payment under contingent liability 1,500          
Change in fair value       0    
Business combination escrow amount 2,800          
Goodwill       $ 3,600    
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 $ 2,800          
Sumitomo [Member]            
Business Acquisition [Line Items]            
Date of acquisition       Mar. 19, 2018    
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). This acquisition establishes ADTRAN as a North American market leader for EPON solutions for the cable MSO industry and it will accelerate the MSO market’s adoption of our open, programmable and scalable architectures.    
Bargain purchase gain net of income taxes   $ 11,322 $ 11,300