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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]    
Net Loss $ (40,453) $ (1,127)
Other Comprehensive Income (Loss), net of tax    
Net unrealized gain (loss) on available-for-sale securities 69 (724)
Defined benefit plan adjustments 35 (13)
Foreign currency translation gain (loss) 8,678 (905)
Other Comprehensive Income (Loss), net of tax 8,782 (1,642)
Comprehensive Loss, net of tax (31,671) (2,769)
Less: Comprehensive Income attributable to non-controlling interest 12  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (31,683) $ (2,769)