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Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2023
EUR (€)
shares
Jun. 30, 2023
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2024
EUR (€)
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2023
EUR (€)
shares
Dec. 31, 2023
USD ($)
Sep. 30, 2024
EUR (€)
Oct. 18, 2022
shares
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 3.37%                   3.37%         3.37%  
Aggregate exit compensation payments obligation including guaranteed interest $ 364,100                   $ 364,100         € 326,900,000  
Expire date of exit compensation                     Mar. 16, 2023 Mar. 16, 2023          
Annual recurring compensation obligation                     $ 10,000 € 8,900,000          
Accrued annual recurring compensation obligation $ 2,400       $ 2,600           $ 7,400   $ 7,600        
Annual recurring compensation paid                             $ 10,100    
Number of shares tendered | shares 830,000                   831,000 831,000 64,000 64,000      
Exit compensation payments         9 € 8,000         $ 17,400 € 15,700,000 $ 1,200 € 1,100      
Cash and cash equivalents $ 88,456     $ 87,167             88,456       87,167    
Less: Net Income attributable to non-controlling interest 2,382 [1] $ 2,504 $ 2,531   2,561 [1]   $ 2,534 $ (715) $ 5,035 $ 1,819 $ 7,417 [1]   4,380 [1]   6,946    
Revision [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Less: Net Income attributable to non-controlling interest   (350) (349)   (353)   (348) (345) (699) (693)     (1,046)   (1,399)    
Previously Reported [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Less: Net Income attributable to non-controlling interest   $ 2,854 $ 2,880   $ 2,914   $ 2,882 $ (370) $ 5,734 $ 2,512     $ 5,426   $ 8,345    
Wells Fargo Credit Agreement [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Net leverage ratio                     0.0325 0.0325          
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          
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          
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Available for future borrowings 205,600                   $ 205,600            
Credit agreement current borrowing capacity $ 24,100                   $ 24,100            
Maximum [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Number of shares tendered | shares         1,000 1,000                      
Maximum [Member] | Wells Fargo Credit Agreement [Member]                                  
Summary Of Significant Accounting Policy [Line Items]                                  
Net leverage ratio       0.05             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]                                  
Net leverage ratio                     0.035 0.035          
Fixed charge coverage ratio       0.0125             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]                                  
Annual recurring compensation payment per share | $ / shares   $ 0.52 $ 0.52 $ 0.52 $ 0.52   $ 0.52 $ 0.52                  
Accrued liability per share | $ / shares   $ 0.59 $ 0.59 $ 0.59 $ 0.59   $ 0.59 $ 0.59                  
Number of shares tendered | shares 830,000                   831,000 831,000 64,000 64,000      
Exit compensation payments         $ 9,000 € 15,700,000         $ 17,400 € 8,000 $ 1,200 € 1,100,000      
Equity ownership percentage 33.00%     34.60%             33.00%       34.60% 33.00%  
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] For the three and nine months ended September 30, 2024, we accrued $2.4 million and $7.4 million, respectively, net income attributable to non-controlling interest, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA. For the three and nine months ended September 30, 2023, we accrued $2.6 million and $7.6 million, respectively, representing the recurring cash compensation earned by non-controlling interest shareholders post-DPLTA, partially offset by a $3.2 million net loss attributable to non-controlling interests pre-DPLTA for the nine months ended September 30, 2023.