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Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss Before Income Taxes	$ (28,467)			$ (92,202)					$ (413,659)	$ (188,546)
Tax (expense) benefit	(390)			16,553					16,121	36,229
Net Loss attributable to ADTRAN Holdings, Inc.	(31,239)	$ (49,515)	$ (324,201)	(78,210)	$ (38,749)	$ (39,738)	$ (373,716)	$ (78,487)	(404,955)	(156,697)	$ (266,289)
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)	(158)			120					(61)	36
Loss Before Income Taxes	(171)			441					(242)	403
Tax (expense) benefit	52			(114)					66	(99)
Net Loss attributable to ADTRAN Holdings, Inc.	(119)			327					(176)	304
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	$ (13)			$ 321					$ (181)	$ 367

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