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Subsequent Events - Additional Information (Detail)
€ in Thousands, $ in Thousands, shares in Millions
3 Months Ended
May 06, 2025
USD ($)
Apr. 14, 2025
EUR (€)
shares
Apr. 14, 2025
USD ($)
shares
Mar. 31, 2025
EUR (€)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
EUR (€)
Mar. 31, 2024
USD ($)
Subsequent Event [Line Items]              
Exit compensation payments       € 12 $ 13 € 4 $ 5
Wells Fargo Credit Agreement Fifth Amendment [Member]              
Subsequent Event [Line Items]              
Secured revolving credit facility amount         374,000    
Credit facility, average outstanding amount         74,000    
Adtran Networks [Member]              
Subsequent Event [Line Items]              
Exit compensation payments       € 12 $ 13 € 4 $ 5
Subsequent Events [Member] | Wells Fargo Credit Agreement Fifth Amendment [Member]              
Subsequent Event [Line Items]              
Secured revolving credit facility amount $ 350,000            
Credit facility, average outstanding amount 50,000            
Threshold prepayments of outstanding loans german commitment reduction amount 25,000            
Subsequent Events [Member] | Adtran Networks [Member]              
Subsequent Event [Line Items]              
Number of shares tendered | shares   0.4 0.4        
Exit compensation payments   € 7,000 $ 7,500        
Subsequent Events [Member] | Adtran Networks [Member] | Wells Fargo Credit Agreement Fifth Amendment [Member]              
Subsequent Event [Line Items]              
Prepayment of outstanding revolving loans $ 24,000