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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2024
EUR (€)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2023
EUR (€)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2024
EUR (€)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2023
EUR (€)
shares
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
USD ($)
Oct. 18, 2022
shares
Jul. 18, 2022
USD ($)
Summary Of Significant Accounting Policy [Line Items]                        
Percentage of guaranteed interest rate 5.00%       5.00%       5.00%      
Percentage of guaranteed interest rate plus a variable component 3.62%       3.62%       3.62%      
Aggregate exit compensation payments obligation including guaranteed interest $ 371,300       $ 371,300       € 345,600,000      
Expire date of exit compensation         Mar. 16, 2023 Mar. 16, 2023            
Annual recurring compensation obligation         $ 11,400 € 10,600,000            
Accrued annual recurring compensation obligation $ 2,900   $ 2,900   $ 5,700   $ 5,700          
Number of shares tendered | shares 1,000 1,000 46,000 46,000 1,000 1,000 63,000 63,000        
Exit compensation payments $ 20 € 19,000 $ 900 € 800 $ 25 € 23,000 $ 1,200 € 1,100,000        
Cash and cash equivalents 111,185       $ 111,185         $ 87,167    
Wells Fargo Credit Agreement [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Covenant relief period, description         the period beginning upon the purchase by the Company of at least 60% of the outstanding shares of Adtran Networks not owned by the Company as of August 9, 2023 and the three consecutive quarterly test periods after such date the period beginning upon the purchase by the Company of at least 60% of the outstanding shares of Adtran Networks not owned by the Company as of August 9, 2023 and the three consecutive quarterly test periods after such date            
Wells Fargo Credit Agreement [Member] | Credit Parties [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Cash and cash equivalents                       $ 50,000
Wells Fargo Credit Agreement [Member] | Company and Subsidiaries [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Cash and cash equivalents                       $ 70,000
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Available for future borrowings 206,000       $ 206,000              
Credit agreement current borrowing capacity $ 16,400       $ 16,400              
Adtran Networks [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Number of shares tendered | shares 1,000 1,000 46,000 46,000 1,000 1,000 63,000 63,000        
Exit compensation payments $ 20 € 19,000 $ 900 € 800 $ 25 € 23,000 $ 1,200 € 1,100,000        
Equity ownership percentage 34.60%       34.60%       34.60% 34.60%    
Adtran Networks [Member] | Maximum [Member]                        
Summary Of Significant Accounting Policy [Line Items]                        
Number of additional shares authorized to purchase | shares                     15,346,544