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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)

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