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Summary of Significant Accounting Policies - Additional Information (Detail)
€ in Thousands, $ in Thousands
 3 Months Ended
Apr. 14, 2025
USD ($)
shares
Apr. 14, 2025
EUR (€)
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
EUR (€)
shares
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2024
EUR (€)
shares
Mar. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Oct. 18, 2022
shares
Summary Of Significant Accounting Policy [Line Items]                  
Percentage of guaranteed interest rate     5.00%       5.00%    
Percentage of guaranteed interest rate plus a variable component     2.27%       2.27%    
Aggregate exit compensation payments obligation including guaranteed interest     $ 366,100       € 338,500    
Expire date of exit compensation     Mar. 16, 2023 Mar. 16, 2023          
Annual recurring compensation obligation     $ 9,700 € 8,900          
Accrued annual recurring compensation obligation     2,400   $ 2,500        
Exit compensation payments     13 € 12 5 € 4      
Cash and cash equivalents     101,321   106,757     $ 76,021  
Less: Net Income attributable to non-controlling interest [1]     $ 2,319   2,530        
Revision [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Less: Net Income attributable to non-controlling interest         (350)        
Previously Reported [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Cash and cash equivalents         106,757        
Less: Net Income attributable to non-controlling interest         2,880        
Wells Fargo Credit Agreement [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Net leverage ratio     0.0325 0.0325          
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Available for future borrowings     $ 180,700            
Credit agreement current borrowing capacity     $ 25,800            
Maximum [Member] | Wells Fargo Credit Agreement [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Net leverage ratio     0.05 0.05          
Maximum [Member] | Wells Fargo Credit Agreement [Member] | First Quarter Ending Springing Covenant Period [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Net leverage ratio     0.04 0.04          
Minimum [Member] | Wells Fargo Credit Agreement [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Fixed charge coverage ratio     0.0125 0.0125          
Minimum [Member] | Wells Fargo Credit Agreement [Member] | Third And Fourth Quarters Ending Springing Covenant Event [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Net leverage ratio     0.035 0.035          
Adtran Networks [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Exit compensation payments     $ 13 € 12 $ 5 € 4      
Equity ownership percentage     33.00%       33.00% 33.00%  
Adtran Networks [Member] | Subsequent Event [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Number of shares tendered | shares 400,000 400,000              
Exit compensation payments $ 7,500 € 7,000              
Adtran Networks [Member] | Maximum [Member]                  
Summary Of Significant Accounting Policy [Line Items]                  
Number of additional shares authorized to purchase | shares                 15,346,544
Number of shares tendered | shares     1,000 1,000 1,000 1,000      
[1] For the three months ended March 31, 2025, we accrued $2.4 million net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the three months ended March 31, 2024, we recognized $2.5 million of net gain attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post DPTLA.