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(Loss) Earnings 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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator        
Net (loss) income attributable to ADTRAN Holdings, Inc. $ (33,334) $ 2,143 $ (67,798) $ 1,016
Denominator        
Weighted average number of shares – basic 78,366 49,123 78,364 49,110
Effect of dilutive securities        
Stock options   84   111
PSUs, RSUs and restricted stock   602   592
Weighted average number of shares – diluted 78,366 49,809 78,364 49,813
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. - basic $ (0.43) $ 0.04 $ (0.87) $ 0.02
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. - diluted $ (0.43) $ 0.04 $ (0.87) $ 0.02