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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net loss $ (75,649) $ (44,859) $ (152,317) $ (43,843)
Other Comprehensive Loss, net of tax        
Net unrealized gain (loss) on available-for-sale securities 391 (396) 454 (1,320)
Defined benefit plan adjustments (83) (118) (25) (218)
Foreign currency translation loss (29,716) (23,172) (14,098) (26,930)
Other Comprehensive Loss, net of tax (29,408) (23,686) (13,669) (28,468)
Comprehensive Loss, net of tax (105,057) (68,545) (165,986) (72,311)
Less: Comprehensive Income (Loss) attributable to non-controlling interest 2,914 (10,156) 5,808 (10,156)
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (107,971) $ (58,389) $ (171,794) $ (62,155)