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Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net Loss $ (441,048) $ (259,343) $ (8,888)
Other Comprehensive (Loss) Income, net of tax      
Net unrealized gain (loss) on available-for-sale securities 0 454 (284)
Defined benefit plan adjustments 1,479 (1,490) 4,597
Foreign currency translation (loss) gain (38,047) 22,757 53,396
Other Comprehensive (Loss) Income, net of tax (36,568) 21,721 57,709
Comprehensive (Loss) Income, net of tax (477,616) (237,622) 48,821
Less: Comprehensive Income attributable to non-controlling interest 9,824 7,328 12,818
Comprehensive (Loss) Income attributable to ADTRAN Holdings, Inc., net of tax $ (487,440) $ (244,950) $ 36,003