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Loss per share - Summary of Calculation of Basic and Diluted Loss Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator        
Net loss attributable to ADTRAN Holdings, Inc. $ (72,735) $ (41,934) $ (140,533) $ (40,918)
Denominator        
Weighted average number of shares – basic 78,389 73,036 78,378 57,175
Effect of dilutive securities        
Weighted average number of shares – diluted 78,389 73,036 78,378 57,175
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (0.93) $ (0.57) $ (1.79) $ (0.72)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.93) $ (0.57) $ (1.79) $ (0.72)