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Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Number of Stock Options, Stock options outstanding, Beginning Balance 3,148  
Number of Stock Options, Stock options granted 8  
Number of Stock Options, Stock options exercised (6)  
Number of Stock Options, Stock options forfeited (36)  
Number of Stock Options, Stock options expired (26)  
Number of Stock Options, Stock options outstanding, Ending Balance 3,088 3,148
Number of Stock Options, Stock options exercisable 1,701  
Weighted Avg. Exercise Price, Stock options outstanding, Beginning Balance $ 14.37  
Weighted Avg. Exercise Price, Stock options granted 12.17  
Weighted Avg. Exercise Price, Stock options exercised 9.82  
Weighted Avg. Exercise Price, Stock options forfeited 12.24  
Weighted Avg. Exercise Price, Stock options expired 15.46  
Weighted Avg. Exercise Price, Stock options outstanding, Ending Balance 14.39 $ 14.37
Weighted Avg. Exercise Price, Stock options exercisable $ 15.89  
Weighted Avg. Remaining Contractual Life In Years, Stock options outstanding 2 years 11 months 4 days 3 years 5 months 1 day
Weighted Avg. Remaining Contractual Life in Years, Stock options exercisable 1 year 5 months 23 days  
Aggregate Intrinsic Value, Stock options outstanding $ 16,251  
Aggregate Intrinsic Value, Stock options outstanding 2,582 $ 16,251
Aggregate Intrinsic Value, Stock options exercisable $ 1,514  
Adtran Networks SE [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Number of Stock Options, Stock options outstanding, Beginning Balance 81  
Number of Stock Options, Stock options exercised (12)  
Number of Stock Options, Stock options expired (1)  
Number of Stock Options, Stock options outstanding, Ending Balance 68 81
Number of Stock Options, Stock options exercisable 13  
Weighted Avg. Exercise Price, Stock options outstanding, Beginning Balance $ 8.58  
Weighted Avg. Exercise Price, Stock options exercised 8.47  
Weighted Avg. Exercise Price, Stock options expired 9.49  
Weighted Avg. Exercise Price, Stock options outstanding, Ending Balance 8.77 $ 8.58
Weighted Avg. Exercise Price, Stock options exercisable $ 6.41  
Weighted Avg. Remaining Contractual Life In Years, Stock options outstanding 3 years 10 months 17 days 4 years
Weighted Avg. Remaining Contractual Life in Years, Stock options exercisable 1 year 4 months 20 days  
Aggregate Intrinsic Value, Stock options outstanding $ 1,222  
Aggregate Intrinsic Value, Stock options outstanding 865 $ 1,222
Aggregate Intrinsic Value, Stock options exercisable $ 197