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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator        
Net Loss attributable to ADTRAN Holdings, Inc. $ (49,865) $ (39,097) $ (374,415) $ (79,180)
Denominator        
Weighted average number of shares – basic 78,852 78,366 78,803 78,364
Effect of dilutive securities        
Weighted average number of shares – diluted 78,852 78,366 78,803 78,364
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (0.63) $ (0.5) $ (4.75) $ (1.01)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.63) $ (0.5) $ (4.75) $ (1.01)