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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net loss $ (8,948) $ (328,235)
Other Comprehensive Income (Loss), net of tax    
Defined benefit plan adjustments 131 (60)
Foreign currency translation gain (loss) 20,247 (17,773)
Other Comprehensive Income (Loss), net of tax 20,378 (17,833)
Comprehensive Income (Loss), net of tax 11,430 (346,068)
Less: Comprehensive Income attributable to non-controlling interest 2,319 2,531
Comprehensive Income (Loss) attributable to ADTRAN Holdings, Inc., net of tax $ 9,111 $ (348,599)