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Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Loss Before Income Taxes $ (44,875) $ (44,578) $ (385,192) $ (96,344)
Tax (expense) benefit (2,136) 8,363 16,511 19,676
Net Loss attributable to ADTRAN Holdings, Inc. (49,865) (39,097) (374,415) (79,180)
Reclassification Out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Defined benefit plan adjustments - actuarial gain (loss) 10 (33) 97 (84)
Loss Before Income Taxes 3 (5) (71) (38)
Tax (expense) benefit (1) 3 14 15
Net Loss attributable to ADTRAN Holdings, Inc. 2 (2) (57) (23)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net realized gain (loss) on sales of securities $ (7) $ 28 $ (168) $ 46