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Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
(Loss) Income Before Income Taxes $ (44,578) $ 4,291 $ (96,344) $ 756
Tax benefit 8,363 (2,148) 19,676 260
Net (Loss) Income attributable to ADTRAN Holdings, Inc. (39,097) 2,143 (79,180) 1,016
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
(Loss) Income Before Income Taxes (5) (386) (38) (697)
Tax benefit 3 84 15 157
Net (Loss) Income attributable to ADTRAN Holdings, Inc. (2) (302) (23) (540)
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 gain (loss) 28 (512) 46 (842)
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) $ (33) $ 126 $ (84) $ 145