Loss per Share - Summary of Calculations of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator
Net Loss attributable to ADTRAN Holdings, Inc.	$ (267,688)	$ (2,037)	$ (8,635)
Denominator
Weighted average number of shares – basic	78,416	62,346	48,582
Effect of dilutive securities:
Weighted average number of shares – diluted	78,416	62,346	48,582
Loss per share attributable to ADTRAN Holdings, Inc. - basic	$ (3.41)	$ (0.03)	$ (0.18)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted	$ (3.41)	$ (0.03)	$ (0.18)