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Subsequent Events - Additional Information (Detail)
shares in Thousands, $ in Thousands, € in Millions
6 Months Ended 9 Months Ended 12 Months Ended
May 06, 2025
USD ($)
Apr. 14, 2025
USD ($)
shares
Apr. 14, 2025
EUR (€)
shares
Dec. 31, 2024
USD ($)
Jun. 04, 2024
USD ($)
Aug. 09, 2023
USD ($)
Jul. 18, 2022
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
EUR (€)
Subsequent Event [Line Items]                                
Aggregate exit compensation payments obligation including guaranteed interest       $ 344,900           $ 344,900           € 333.2
Number of shares tendered | shares                   831 831 67 67      
Exit compensation payments                   $ 17,400 € 15.7 $ 1,300 € 1.2      
Prepayments of lines of credit               $ 5,000 $ 5,000 $ 31,000   $ 64,987   $ 48,000    
Adtran Networks [Member]                                
Subsequent Event [Line Items]                                
Number of shares tendered | shares                   831 831 67 67      
Exit compensation payments                   $ 17,400 € 15.7 $ 1,300 € 1.2      
Wells Fargo Credit Agreement [Member]                                
Subsequent Event [Line Items]                                
Credit agreement maximum borrowing capacity       340,000           340,000            
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]                                
Subsequent Event [Line Items]                                
Credit agreement maximum borrowing capacity       374,000   $ 400,000 $ 400,000     374,000            
Credit facility, average outstanding amount                   3,600            
Wells Fargo Credit Agreement - Subline [Member] | Acorn HoldCo, Inc., [Member]                                
Subsequent Event [Line Items]                                
Credit facility, average outstanding amount       $ 74,000 $ 100,000 $ 100,000 $ 100,000     $ 74,000            
Threshold prepayments of outstanding loans german commitment reduction amount         $ 75,000                      
Subsequent Event [Member] | Adtran Networks [Member]                                
Subsequent Event [Line Items]                                
Number of shares tendered | shares   400 400                          
Exit compensation payments   $ 7,500 € 7.0                          
Subsequent Event [Member] | Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]                                
Subsequent Event [Line Items]                                
Credit agreement maximum borrowing capacity                             $ 350,000  
Prepayments of lines of credit $ 24,000                              
Threshold prepayments of outstanding loans german commitment reduction amount                             $ 25,000  
Subsequent Event [Member] | Wells Fargo Credit Agreement - Subline [Member] | Acorn HoldCo, Inc., [Member]                                
Subsequent Event [Line Items]                                
Credit facility, average outstanding amount $ 50,000