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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net (loss) income $ (36,215) $ 2,143 $ (76,668) $ 1,016
Other Comprehensive Income (Loss), net of tax        
Net unrealized (loss) gain on available-for-sale securities (6) (200) 63 (924)
Defined benefit plan adjustments 23 (87) 58 (100)
Foreign currency translation gain (loss) 6,940 (2,853) 15,618 (3,758)
Other Comprehensive Income (Loss), net of tax 6,957 (3,140) 15,739 (4,782)
Comprehensive (Loss) Income, net of tax (29,258) (997) (60,929) (3,766)
Less: Comprehensive Income attributable to non-controlling interest, net of tax 2,882   2,894  
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (32,140) $ (997) $ (63,823) $ (3,766)