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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Income Tax Disclosure [Abstract]        
Tax provision computed at the federal statutory rate 21.00% 21.00% 21.00% 21.00%
State income tax provision, net of federal benefit 0.06% 1.34% 2.60%  
Federal research credits 0.68% 3.26% 6.74%  
Foreign taxes 0.50% 3.52% 6.29%  
Tax-exempt income 0.04% 0.06% 0.21%  
Change in valuation allowance (5.88%) (35.19%) 63.92%  
Non-deductible transaction costs     (2.74%)  
Foreign tax credits 0.86% 2.45% (0.40%)  
Stock-based compensation (0.40%) (0.57%) (2.09%)  
Withholding taxes (0.08%) 0.01% 0.03%  
Adtran Networks tax exempt income   1.42%    
Return to accrual (0.50%) 0.62% 0.24%  
Global intangible low-taxed income ("GILTI") (3.14%) (5.87%) (8.08%)  
Adtran Networks Goodwill Impairment (14.17%) (4.62%)    
Other, net (1.00%) 0.40% (0.24%)  
Effective Tax Rate (2.03%) (12.17%) 87.48%