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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 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Numerator                      
Net Loss attributable to ADTRAN Holdings, Inc. $ (31,239) $ (49,515) $ (324,201) $ (78,210) $ (38,749) $ (39,738) $ (373,716) $ (78,487) $ (404,955) $ (156,697) $ (266,289)
Gain on redemption of redeemable non-controlling interest 2,976               2,976    
Net loss attributable to ADTRAN Holdings, Inc. for loss per share computation $ (28,263)     $ (78,210)         $ (401,979) $ (156,697)  
Denominator                      
Weighted average number of shares – basic 78,952     78,389         78,873 78,378  
Effect of dilutive securities                      
Weighted average number of shares – diluted 78,952     78,389         78,873 78,378  
Loss per share attributable to ADTRAN Holdings, Inc. - basic $ (0.36) [1] $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.74) $ (1) $ (5.1) [1] $ (2) $ (3.39)
Loss per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.36) [1] $ (0.63) $ (4.12) $ (1) $ (0.5) $ (0.51) $ (4.74) $ (1) $ (5.1) [1] $ (2) $ (3.39)
[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 three and nine months ended September 30, 2024. See Note 15 for additional information.