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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator      
Net Loss attributable to ADTRAN Holdings, Inc. $ (450,872) $ (266,289) $ (2,037)
Effect of redemption of RNCI 2,981    
Net loss attributable to ADTRAN Holdings, Inc. common stockholders $ (447,891) $ (266,289) $ (2,037)
Denominator      
Weighted average number of shares – basic 78,928 78,416 62,346
Effect of dilutive securities:      
Weighted average number of shares – diluted 78,928 78,416 62,346
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (5.67) [1] $ (3.39) $ (0.03)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (5.67) [1] $ (3.39) $ (0.03)
[1] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $3.0 million effect of redemption of RNCI for the year ended December 31, 2024. See Note 19 for additional information.