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Employee Benefit Plans (401(k) Savings Plans) - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Contribution Plan Disclosure [Line Items]      
Criteria of employer to contribute in employee saving plan 100% of an employee’s first 3% of contributions and 50% of their next 2% of contributions    
Percentage of employer match to employee's contribution 100.00%    
Percentage of employer match to employee's contribution 50.00%    
Upper limit of employer match 4.00%    
Percentage of employee first contribution 3.00%    
Percentage of employee second contribution 2.00%    
Contribution expense and plan administration costs for savings plan $ 3,500,000 $ 4,200,000 $ 4,100,000
Adtran Networks [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Criteria of employer to contribute in employee saving plan 25% of an employee's first 6% of contributions    
Percentage of employer match to employee's contribution 25.00%    
Upper limit of employer match 1.50%    
Percentage of employee first contribution 6.00%    
Vesting period 5 years    
Maximum statutory compensation amount $ 345,000    
Adtran Networks [Member] | Maximum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percent of match 50.00%