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(Loss) Earnings per Share - Summary of Calculations of Basic and Diluted (Loss) Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator      
Net loss attributable to ADTRAN Holdings, Inc. $ (2,037) $ (8,635) $ 2,378
Denominator      
Weighted average number of shares – basic 62,346 48,582 47,996
Effect of dilutive securities:      
PSUs, RSUs and restricted stock     292
Weighted average number of shares – diluted 62,346 48,582 48,288
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. - basic $ (0.03) $ (0.18) $ 0.05
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.03) $ (0.18) $ 0.05