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Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Loss Before Income Taxes $ (49,171) $ (9,135) $ (48,415) $ (978)
Tax benefit (expense) 4,312 (1,292) 4,572 (3,467)
Net Loss attributable to ADTRAN Holdings, Inc. (41,934) (10,427) (40,918) (4,445)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Loss Before Income Taxes 358 (138) (339) (643)
Tax benefit (expense) (98) 46 59 198
Net Loss attributable to ADTRAN Holdings, Inc. 260 (92) (280) (445)
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 187 42 (655) (13)
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) $ (171) $ (180) $ 316 $ (630)