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Stock-Based Compensation - Summary of Stock Options Outstanding (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Number of Stock Options, Stock options outstanding, Beginning Balance | shares 3,148  
Number of Stock Options, Stock options granted | shares 7  
Number of Stock Options, Stock options exercised | shares (8)  
Number of Stock Options, Stock options forfeited | shares (40)  
Number of Stock Options, Stock options expired | shares (33)  
Number of Stock Options, Stock options outstanding, Ending Balance | shares 3,074 3,148
Number of Stock Options, Stock options exercisable | shares 1,691  
Weighted Avg. Exercise Price, Stock options outstanding, Beginning Balance | $ / shares $ 14.37  
Weighted Avg. Exercise Price, Stock options granted | $ / shares 12.17  
Weighted Avg. Exercise Price, Stock options exercised | $ / shares 8.72  
Weighted Avg. Exercise Price, Stock options forfeited | $ / shares 11.93  
Weighted Avg. Exercise Price, Stock options expired | $ / shares 16.44  
Weighted Avg. Exercise Price, Stock options outstanding, Ending Balance | $ / shares 14.39 $ 14.37
Weighted Avg. Exercise Price, Stock options exercisable | $ / shares $ 15.88  
Weighted Avg. Remaining Contractual Life In Years, Stock options outstanding 2 years 8 months 4 days 3 years 5 months 1 day
Weighted Avg. Remaining Contractual Life in Years, Stock options exercisable 1 year 2 months 23 days  
Aggregate Intrinsic Value, Stock options outstanding | $ $ 16,251  
Aggregate Intrinsic Value, Stock options outstanding | $ 736 $ 16,251
Aggregate Intrinsic Value, Stock options exercisable | $ $ 556  
Adtran Networks SE [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Number of Stock Options, Stock options outstanding, Beginning Balance | shares 81  
Number of Stock Options, Stock options exercised | shares (13)  
Number of Stock Options, Stock options forfeited | shares (9)  
Number of Stock Options, Stock options expired | shares (1)  
Number of Stock Options, Stock options outstanding, Ending Balance | shares 58 81
Number of Stock Options, Stock options exercisable | shares 12  
Weighted Avg. Exercise Price, Stock options outstanding, Beginning Balance | $ / shares $ 8.58  
Weighted Avg. Exercise Price, Stock options exercised | $ / shares 8.22  
Weighted Avg. Exercise Price, Stock options forfeited | $ / shares 10.58  
Weighted Avg. Exercise Price, Stock options expired | $ / shares 9.2  
Weighted Avg. Exercise Price, Stock options outstanding, Ending Balance | $ / shares 8.18 $ 8.58
Weighted Avg. Exercise Price, Stock options exercisable | $ / shares $ 6.03  
Weighted Avg. Remaining Contractual Life In Years, Stock options outstanding 3 years 4 months 20 days 4 years
Weighted Avg. Remaining Contractual Life in Years, Stock options exercisable 1 year 5 months 23 days  
Aggregate Intrinsic Value, Stock options outstanding | $ $ 1,222  
Aggregate Intrinsic Value, Stock options outstanding | $ 746 $ 1,222
Aggregate Intrinsic Value, Stock options exercisable | $ $ 182