v3.26.1
Commitments and Contingencies - Additional Information (Detail)
€ / shares in Units, $ in Thousands, € in Millions, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 23, 2026
Feb. 20, 2026
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2026
EUR (€)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2025
EUR (€)
shares
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2026
EUR (€)
€ / shares
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2025
EUR (€)
shares
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Commitments And Contingencies Line Items                          
Cash compensation per share | € / shares                 € 17.21        
Recurring cash compensation per share | € / shares                 € 0.52        
Aggregate exit compensation payments obligation including guaranteed interest     $ 334,200 $ 334,200       $ 334,200       € 292.6  
Number of shares tendered | shares       0.4 0.4 0.9 0.9 0.6 0.6 0.9 0.9    
Percentage of guaranteed interest rate     5.00% 5.00%       5.00%       5.00%  
Percentage of guaranteed interest rate plus a variable component     1.27% 1.27%       1.27%       1.27%  
Annual recurring compensation obligation               $ 8,700 € 7.6        
Expire date of exit compensation               Mar. 16, 2023 Mar. 16, 2023        
Accrued annual recurring compensation obligation       $ 2,100   $ 2,400   $ 4,300   $ 4,800      
Annual recurring compensation paid     $ 8,900                    
Commitments related to performance bonds     23,300 23,300       $ 23,300         $ 22,400
Commitments related to performance bonds expiration month and year               2029-10 2029-10        
Purchase obligations     232,000 232,000       $ 232,000          
Percentage of new import tariffs   10.00%                      
Accrued wages and benefits     25,613 $ 25,613       $ 25,613         $ 32,203
Adtran Networks [Member]                          
Commitments And Contingencies Line Items                          
Number of shares tendered | shares       0.4 0.4 0.9 0.9 0.6 0.6 0.9 0.9    
Exit compensation payments       $ 13,800 € 11.7 $ 19,400 € 16.9 $ 13,800 € 11.7 $ 19,400 € 16.9    
Subsequent Events [Member] | Minimum [Member]                          
Commitments And Contingencies Line Items                          
Percentage of additional ad valorem tariffs 10.00%                        
Subsequent Events [Member] | Maximum [Member]                          
Commitments And Contingencies Line Items                          
Percentage of additional ad valorem tariffs 12.50%                        
401(k) Retirement Plan [Member]                          
Commitments And Contingencies Line Items                          
Accrued wages and benefits     $ 1,400 $ 1,400       $ 1,400