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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, 2024
Mar. 31, 2023
Numerator    
Net Loss attributable to ADTRAN Holdings, Inc. $ (324,550) $ (40,083)
Denominator    
Weighted average number of shares – basic 78,814 78,358
Effect of dilutive securities    
Weighted average number of shares – diluted 78,814 78,358
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (4.12) $ (0.51)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (4.12) $ (0.51)