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Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Loss Before Income Taxes $ (92,202) $ (49,171) $ (188,546) $ (48,415)
Tax benefit 16,553 4,312 36,229 4,572
Net Loss attributable to ADTRAN Holdings, Inc. (72,735) (41,934) (140,533) (40,918)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Loss Before Income Taxes 441 358 403 (339)
Tax benefit (114) (98) (99) 59
Net Loss attributable to ADTRAN Holdings, Inc. 327 260 304 (280)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized (Losses) Gains on Available-for-Sale Securities [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net investment (loss) gain 321 187 367 (655)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Other Income (Expense), Net [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Defined benefit plan adjustments - actuarial loss $ 120 $ 171 $ 36 $ 316