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Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net Loss $ (259,343) $ (8,888) $ (8,635)
Other Comprehensive Income (Loss), net of tax      
Net unrealized gain (loss) on available-for-sale securities 454 (284) (584)
Defined benefit plan adjustments (1,490) 4,597 4,008
Foreign currency translation gain (loss) 22,753 53,396 (3,699)
Other Comprehensive Income (Loss), net of tax 21,717 57,709 (275)
Comprehensive (Loss) Income, net of tax (237,626) 48,821 (8,910)
Less: Comprehensive Income attributable to non-controlling interest 8,727 12,818  
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax $ (246,353) $ 36,003 $ (8,910)