Loss Per Share - Summary of Calculation of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator
Net loss attributable to ADTRAN Holdings, Inc.	$ (40,083)	$ (1,127)
Denominator
Weighted average number of shares – basic	78,358	49,113
Effect of dilutive securities
Weighted average number of shares – diluted	78,358	49,113
Loss per share attributable to ADTRAN Holdings, Inc. - basic	$ (0.51)	$ (0.02)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted	$ (0.51)	$ (0.02)