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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net loss $ (321,670) $ (40,453)
Other Comprehensive (Loss) Income, net of tax    
Net unrealized gain on available-for-sale securities   69
Defined benefit plan adjustments (60) 35
Foreign currency translation (loss) gain (17,745) 8,678
Other Comprehensive (Loss) Income, net of tax (17,805) 8,782
Comprehensive Loss, net of tax (339,475) (31,671)
Less: Comprehensive Income attributable to non-controlling interest, net of tax 2,880 12
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (342,355) $ (31,683)