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Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Loss Before Income Taxes $ (9,345) $ (346,882)
Tax expense 397 18,647
Net Loss attributable to ADTRAN Holdings, Inc. (11,267) (330,765)
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) 190 (87)
Loss Before Income Taxes 125 74
Tax expense (42) (15)
Net Loss attributable to ADTRAN Holdings, Inc. 83 59
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 $ (65) $ 161