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Business Combination Agreement - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 15, 2022
USD ($)
$ / shares
Aug. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Aug. 30, 2021
€ / shares
shares
Business Acquisition [Line Items]            
Common stock, par value | $ / shares   $ 0.01 $ 0.01 $ 0.01    
Common stock, shares outstanding | shares     77,889,000 49,063,000    
Common stock, reserved for future issuance | shares   27,994,595       27,994,595
Goodwill $ 350,500   $ 381,724 $ 6,968    
Total revenue     1,025,536 563,004 $ 506,510  
Net loss attributable to ADTRAN Holdings, Inc.     (2,037) (8,635) 2,378  
Net loss attributable to non-controlling interest     (6,851)      
Decrease in goodwill (8,700)          
Network Solutions [Member]            
Business Acquisition [Line Items]            
Goodwill     298,280 6,570    
Total revenue     916,793 498,834 438,015  
Services & Support [Member]            
Business Acquisition [Line Items]            
Goodwill     83,444 398    
Total revenue     108,743 64,170 $ 68,495  
Common Stock [Member]            
Business Acquisition [Line Items]            
Percentage of common stock exchanged   64.00%        
ADVA Optical Networking SE [Member]            
Business Acquisition [Line Items]            
Business combination date of agreement   Aug. 30, 2021        
Common stock, shares outstanding | shares   33,957,538       33,957,538
Percentage of outstanding bearer shares   65.43%        
Fair value of stock options assumed   $ 12,800        
Goodwill 350,458   350,500      
Accounts receivable 114,659          
Other receivables 1,457          
Unpaid principal balance of account receivable 118,500          
Unpaid principal balance of other receivable 1,500          
Fair value of noncontrolling interest 316,415          
Total revenue 365,900          
Net loss attributable to ADTRAN Holdings, Inc. $ 12,900          
Shares held by noncontrolling interest | shares   17,941,496       17,941,496
Closing share price | (per share) $ 20.2 $ 17.64       € 17.58
Currency conversion rate 1.00318          
Net loss attributable to non-controlling interest     (6,900)      
ADVA Optical Networking SE [Member] | Selling, General and Administrative Expenses [Member]            
Business Acquisition [Line Items]            
Transaction costs incurred     26,100      
Transaction costs related to the business combination     $ 14,200 $ 11,900    
ADVA Optical Networking SE [Member] | Network Solutions [Member]            
Business Acquisition [Line Items]            
Goodwill $ 272,800          
ADVA Optical Networking SE [Member] | Services & Support [Member]            
Business Acquisition [Line Items]            
Goodwill $ 77,700          
ADVA Optical Networking SE [Member] | Common Stock [Member]            
Business Acquisition [Line Items]            
Number of shares issuable for each share of acquired entity | shares   0.8244        
Percentage of common stock exchanged   36.00%