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Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Loss Before Income Taxes $ (51,766) $ (3,535)
Tax benefit 11,313 2,408
Net Loss attributable to ADTRAN Holdings, Inc. (40,083) (1,127)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Loss Before Income Taxes (33) (311)
Tax benefit 12 73
Net Loss attributable to ADTRAN Holdings, Inc. (21) (238)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net investment (loss) gain 18 (330)
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 gain (loss) $ (51) $ 19