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Summary of Significant Accounting Policies - Summary of Impact of Revision to Specific Line Items in Consolidated Balance Sheets, Consolidated Statement of Loss, and Consolidated Statement of Comprehensive Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Accrued expenses and other liabilities $ 35,704 $ 36,204    
Total Current Liabilities 293,645 278,108    
Total Liabilities 622,015 635,531    
Redeemable Non-Controlling Interest 422,943 442,152    
Accumulated Other Comprehensive Income 10,897 47,465    
Retained Deficit (680,993) (232,905)    
Total Equity 134,414 604,829 $ 1,303,613 $ 357,102
Total Liabilities, Redeemable Non-Controlling Interest and Equity 1,179,372 1,682,512    
Less: Net Income attributable to non-controlling interest [1] 9,824 6,946 (6,851)  
Net Loss attributable to ADTRAN Holdings, Inc. $ (450,872) $ (266,289) $ (2,037)  
Loss per common share attributable to ADTRAN Holdings, Inc. - basic $ (5.67) [2] $ (3.39) $ (0.03)  
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted $ (5.67) [2] $ (3.39) $ (0.03)  
Foreign currency translation gain $ (38,047) $ 22,757 $ 53,396  
Other Comprehensive Income, net of tax (36,568) 21,721 57,709  
Comprehensive Loss, net of tax (477,616) (237,622) 48,821  
Less: Comprehensive Income attributable to non-controlling interest, net of tax 9,824 7,328 12,818  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (487,440) (244,950) $ 36,003  
As Previously Reported [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Accrued expenses and other liabilities   37,607    
Total Current Liabilities   279,511    
Total Liabilities   636,934    
Redeemable Non-Controlling Interest   451,756    
Accumulated Other Comprehensive Income   47,461    
Retained Deficit   (243,908)    
Total Equity   593,822    
Total Liabilities, Redeemable Non-Controlling Interest and Equity   1,682,512    
Less: Net Income attributable to non-controlling interest   8,345    
Net Loss attributable to ADTRAN Holdings, Inc.   $ (267,688)    
Loss per common share attributable to ADTRAN Holdings, Inc. - basic   $ (3.41)    
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted   $ (3.41)    
Foreign currency translation gain   $ 22,753    
Other Comprehensive Income, net of tax   21,717    
Comprehensive Loss, net of tax   (237,626)    
Less: Comprehensive Income attributable to non-controlling interest, net of tax   8,727    
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax   (246,353)    
Revision [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Accrued expenses and other liabilities   (1,403)    
Total Current Liabilities   (1,403)    
Total Liabilities   (1,403)    
Redeemable Non-Controlling Interest   (9,604)    
Accumulated Other Comprehensive Income   4    
Retained Deficit   11,003    
Total Equity   11,007    
Less: Net Income attributable to non-controlling interest   (1,399)    
Net Loss attributable to ADTRAN Holdings, Inc.   $ 1,399    
Loss per common share attributable to ADTRAN Holdings, Inc. - basic   $ 0.02    
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted   $ 0.02    
Foreign currency translation gain   $ 4    
Other Comprehensive Income, net of tax   4    
Comprehensive Loss, net of tax   4    
Less: Comprehensive Income attributable to non-controlling interest, net of tax   (1,399)    
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax   $ 1,403    
[1] For the year ended December 31, 2024 we accrued $9.8 million of net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the year ended December 31, 2023, we accrued $10.1 million, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA, partially offset by a $3.2 million net loss attributable to non-controlling interests pre-DPLTA.12-24
[2] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $3.0 million effect of redemption of RNCI for the year ended December 31, 2024. See Note 19 for additional information.