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Restatement of Quarterly Financial Information - Schedule of Restatement of Condensed Consolidated Statements of Changes in Stockholders Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance $ 126,951 $ 605,257
Net loss (8,948) (328,235)
Annual recurring compensation earned (2,319) (2,531)
Other comprehensive loss, net of tax 20,378 (17,833)
Deferred compensation adjustments, net of tax 38 262
ADTRAN RSUs and restricted stock vested (1,170) (242)
ADTRAN Stock options exercised 756 219
ADTRAN stock based compensation expense 2,062 3,957
Redemption of redeemable non controlling interest (3) 1
Ending Balance 138,893 260,849
Adtran Networks SE [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
ADTRAN stock based compensation expense 1,148 (6)
Retained Deficit [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance (688,813) (231,706)
Net loss (8,948) (328,235)
Annual recurring compensation earned (2,319) (2,531)
Deferred compensation adjustments, net of tax   3
ADTRAN RSUs and restricted stock vested (1,174) (243)
ADTRAN Stock options exercised 755 219
Redemption of redeemable non controlling interest (3) 1
Ending Balance (700,502) (562,492)
Accumulated Other Comprehensive Income [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance 11,254 47,530
Other comprehensive loss, net of tax 20,378 (17,833)
Deferred compensation adjustments, net of tax  
Ending Balance 31,632 29,697
Additional Paid-in Capital [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance 808,913 794,468
Deferred compensation adjustments, net of tax (52) (368)
ADTRAN stock based compensation expense 2,062 3,957
Ending Balance 812,071 798,051
Additional Paid-in Capital [Member] | Adtran Networks SE [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
ADTRAN stock based compensation expense $ 1,148 (6)
As Reported [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Other comprehensive loss, net of tax   (17,805)
Ending Balance   265,783
As Reported [Member] | Adtran Networks SE [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
ADTRAN stock based compensation expense   4
As Reported [Member] | Retained Deficit [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   (243,908)
Net loss   (321,670)
Annual recurring compensation earned   (2,880)
Deferred compensation adjustments, net of tax   3
ADTRAN RSUs and restricted stock vested   (243)
ADTRAN Stock options exercised   219
Redemption of redeemable non controlling interest   1
Foreign currency remeasurement of redeemable non-controlling interest   10,115
Ending Balance   (558,363)
As Reported [Member] | Accumulated Other Comprehensive Income [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   47,461
Other comprehensive loss, net of tax   (17,805)
Ending Balance   29,656
As Reported [Member] | Additional Paid-in Capital [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   795,304
Deferred compensation adjustments, net of tax   (368)
ADTRAN stock based compensation expense   3,957
Ending Balance   798,897
Adjustment [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Other comprehensive loss, net of tax   (28)
Ending Balance   (4,934)
Adjustment [Member] | Adtran Networks SE [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
ADTRAN stock based compensation expense   (10)
Adjustment [Member] | Retained Deficit [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   12,202
Net loss   (6,565)
Annual recurring compensation earned   349
Foreign currency remeasurement of redeemable non-controlling interest   (10,115)
Ending Balance   (4,129)
Adjustment [Member] | Accumulated Other Comprehensive Income [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   69
Other comprehensive loss, net of tax   (28)
Ending Balance   41
Adjustment [Member] | Additional Paid-in Capital [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Beginning Balance   (836)
Ending Balance   $ (846)