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Restatement of Quarterly Financial Information - Schedule of Restatement of Condensed Consolidated Statement of Loss and Condensed Consolidated Statement of Comprehensive Loss (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenue    
Total Revenue $ 247,744,000 $ 226,173,000
Cost of Revenue    
Total Cost of Revenue 152,568,000 155,858,000
Gross Profit 95,176,000 70,315,000
Selling, general and administrative expenses 50,285,000 58,991,000
Research and development expenses 48,859,000 60,215,000
Goodwill impairment 0 297,353,000
Operating Loss (3,968,000) (346,244,000)
Interest and dividend income 126,000 397,000
Interest expense (4,761,000) (4,598,000)
Net investment gain (1,686,000) 2,253,000
Other income, net 944,000 1,310,000
Loss Before Income Taxes (9,345,000) (346,882,000)
Income tax benefit 397,000 18,647,000
Net Loss (8,948,000) (328,235,000)
Less: Net Income attributable to non-controlling interest [1] 2,319,000 2,530,000
Net Loss attributable to ADTRAN Holdings, Inc. $ (11,267,000) $ (330,765,000)
Weighted average shares outstanding - basic 79,534 78,814
Weighted average shares outstanding - diluted 79,534 78,814
Loss per common share attributable to ADTRAN Holdings, Inc. - basic $ (0.14) [2] $ (4.2)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted $ (0.14) [2] $ (4.2)
Net Loss $ (8,948,000) $ (328,235,000)
Other Comprehensive Loss, net of tax    
Defined benefit plan adjustments 131,000 (60,000)
Foreign currency translation loss 20,247,000 (17,773,000)
Other Comprehensive Income (Loss), net of tax 20,378,000 (17,833,000)
Comprehensive Income (Loss), net of tax 11,430,000 (346,068,000)
Less: Comprehensive Income attributable to non-controlling interest, net of tax 2,319,000 2,531,000
Comprehensive Income (Loss) attributable to ADTRAN Holdings, Inc., net of tax 9,111,000 (348,599,000)
Network Solutions [Member]    
Revenue    
Total Revenue 202,217,000 181,273,000
Cost of Revenue    
Total Cost of Revenue 134,241,000 128,266,000
Gross Profit 67,976,000 44,225,000
Goodwill impairment   297,400,000
Network Solutions Inventory Write-Down and Other Charges [Member]    
Cost of Revenue    
Total Cost of Revenue   8,782,000
Services & Support [Member]    
Revenue    
Total Revenue 45,527,000 44,900,000
Cost of Revenue    
Total Cost of Revenue 18,327,000 18,810,000
Gross Profit $ 27,200,000 26,090,000
As Reported [Member]    
Revenue    
Total Revenue   226,173,000
Cost of Revenue    
Total Cost of Revenue   153,918,000
Gross Profit   72,255,000
Selling, general and administrative expenses   59,100,000
Research and development expenses   60,251,000
Goodwill impairment   292,583,000
Operating Loss   (339,679,000)
Interest and dividend income   397,000
Interest expense   (4,598,000)
Net investment gain   2,253,000
Other income, net   1,310,000
Loss Before Income Taxes   (340,317,000)
Income tax benefit   18,647,000
Net Loss   (321,670,000)
Less: Net Income attributable to non-controlling interest   2,880,000
Net Loss attributable to ADTRAN Holdings, Inc.   $ (324,550,000)
Weighted average shares outstanding - basic   78,814
Weighted average shares outstanding - diluted   78,814
Loss per common share attributable to ADTRAN Holdings, Inc. - basic   $ (4.12)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted   $ (4.12)
Net Loss   $ (321,670,000)
Other Comprehensive Loss, net of tax    
Defined benefit plan adjustments   (60,000)
Foreign currency translation loss   (17,745,000)
Other Comprehensive Income (Loss), net of tax   (17,805,000)
Comprehensive Income (Loss), net of tax   (339,475,000)
Less: Comprehensive Income attributable to non-controlling interest, net of tax   2,880,000
Comprehensive Income (Loss) attributable to ADTRAN Holdings, Inc., net of tax   (342,355,000)
As Reported [Member] | Network Solutions [Member]    
Revenue    
Total Revenue   181,273,000
Cost of Revenue    
Total Cost of Revenue   126,326,000
As Reported [Member] | Network Solutions Inventory Write-Down and Other Charges [Member]    
Cost of Revenue    
Total Cost of Revenue   8,782,000
As Reported [Member] | Services & Support [Member]    
Revenue    
Total Revenue   44,900,000
Cost of Revenue    
Total Cost of Revenue   18,810,000
Adjustment [Member]    
Cost of Revenue    
Total Cost of Revenue   1,940,000
Gross Profit   (1,940,000)
Selling, general and administrative expenses   (109,000)
Research and development expenses   (36,000)
Goodwill impairment   4,770,000
Operating Loss   (6,565,000)
Loss Before Income Taxes   (6,565,000)
Net Loss   (6,565,000)
Less: Net Income attributable to non-controlling interest   (350,000)
Net Loss attributable to ADTRAN Holdings, Inc.   $ (6,215,000)
Weighted average shares outstanding - basic   78,814
Weighted average shares outstanding - diluted   78,814
Loss per common share attributable to ADTRAN Holdings, Inc. - basic   $ (0.08)
Loss per common share attributable to ADTRAN Holdings, Inc. - diluted   $ (0.08)
Net Loss   $ (6,565,000)
Other Comprehensive Loss, net of tax    
Foreign currency translation loss   (28,000)
Other Comprehensive Income (Loss), net of tax   (28,000)
Comprehensive Income (Loss), net of tax   (6,593,000)
Less: Comprehensive Income attributable to non-controlling interest, net of tax   (349,000)
Comprehensive Income (Loss) attributable to ADTRAN Holdings, Inc., net of tax   (6,244,000)
Adjustment [Member] | Network Solutions [Member]    
Cost of Revenue    
Total Cost of Revenue   $ 1,940,000
[1] For the three months ended March 31, 2025, we accrued $2.4 million net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the three months ended March 31, 2024, we recognized $2.5 million of net gain attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post DPTLA.
[2] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $(3) thousand effect of redemption of RNCI for the three months ended March 31, 2025. See Note 14 for additional information.