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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, 2025
Mar. 31, 2024
Numerator    
Net Loss attributable to ADTRAN Holdings, Inc. $ (11,267) $ (330,765)
Effect of redemption of RNCI (3)  
Net loss attributable to ADTRAN Holdings, Inc. common stockholders $ (11,270) $ (330,765)
Denominator    
Weighted average number of shares – basic 79,534 78,814
Effect of dilutive securities    
Weighted average number of shares – diluted 79,534 78,814
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (0.14) [1] $ (4.2)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.14) [1] $ (4.2)
[1] Loss per common share attributable to ADTRAN Holdings, Inc. - basic and diluted - reflects a $(3) thousand effect of redemption of RNCI for the three months ended March 31, 2025. See Note 14 for additional information.