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Summary of Significant Accounting Policies - Additional Information (Detail) € / shares in Units, € in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
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Oct. 01, 2024 USD ($) | Jun. 30, 2024 € / shares | Mar. 31, 2024 USD ($) | Mar. 31, 2024 € / shares | Dec. 31, 2023 USD ($) € / shares | Sep. 30, 2023 € / shares | Jun. 30, 2023 € / shares | Mar. 31, 2023 € / shares | Dec. 31, 2024 USD ($) IncentivePlan shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2024 EUR (€) IncentivePlan | Oct. 18, 2022 shares | Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, uninsured amount |  |  |  |  |  |  |  |  | $ 74,000,000 |  |  |  |  |  |  |
Percentage of guaranteed interest rate |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  | 5.00% |  |
Percentage of guaranteed interest rate plus a variable component |  |  |  |  |  |  |  |  | 3.37% |  |  |  |  | 3.37% |  |
Aggregate exit compensation payments obligation including guaranteed interest |  |  |  |  |  |  |  |  | $ 344,900,000 |  |  |  |  | € 333.2 |  |
Expire date of exit compensation |  |  |  |  |  |  |  |  | Mar. 16, 2023 | Mar. 16, 2023 |  |  |  |  |  |
Annual recurring compensation obligation |  |  |  |  |  |  |  |  | $ 9,300,000 | € 8.9 |  |  |  |  |  |
Accrued annual recurring compensation obligation |  |  |  |  |  |  |  |  | $ 9,800,000 |  | $ 10,100,000 |  |  |  |  |
Number of shares tendered | shares |  |  |  |  |  |  |  |  | 831,000 | 831,000 | 67,000 | 67,000 |  |  |  |
Exit compensation payments |  |  |  |  |  |  |  |  | $ 17,400,000 | € 15.7 | $ 1,300,000 | € 1.2 |  |  |  |
Amount of redemptions |  |  |  |  |  |  |  |  | 17,400,000 |  |  |  |  |  |  |
Total carrying value of assets held for sale |  |  |  |  |  |  |  |  | 11,901,000 |  |  |  |  |  |  |
Impairment losses for long-lived assets and intangible assets |  |  |  |  |  |  |  |  | 0 |  | 0 |  | $ 0 |  |  |
Long-lived assets |  |  |  |  | $ 337,423,000 |  |  |  | 284,893,000 |  | 337,423,000 |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |  |  |  | 292,583,000 |  | 37,874,000 |  | 0 |  |  |
Goodwill impairment charges, other |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Impairment charges related to capitalized implementation costs |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | 16,900,000 |  |  |
Period of assurance-based warranty for product defects |  |  |  |  |  |  |  |  | 90 days to five years | 90 days to five years |  |  |  |  |  |
Liability for warranty obligations |  |  |  |  | 6,445,000 |  |  |  | $ 4,512,000 |  | 6,445,000 |  | 7,196,000 |  |  | $ 5,403,000
Number of stock incentive plans | IncentivePlan |  |  |  |  |  |  |  |  | 2 |  |  |  |  | 2 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | $ 15,342,000 |  | 16,016,000 |  | 28,322,000 |  |  |
Reduction of research and development expense recognized |  |  |  |  |  |  |  |  | 9,200,000 |  | 5,200,000 |  | 1,100,000 |  |  |
Research and development costs |  |  |  |  |  |  |  |  | 221,463,000 |  | 258,311,000 |  | 173,757,000 |  |  |
Network Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets |  |  |  |  |  |  |  |  | 358,600,000 |  |  |  |  |  |  |
Goodwill impairment |  |  | $ 292,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Services & Support [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | 37,900,000 |  |  |  |  |
Purchase Agreement [Member] | Prior Factoring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement current borrowing capacity |  |  |  |  | 14,300,000 |  |  |  | $ 0 |  | 14,300,000 |  |  |  |  |
ASU 2023-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  |  |  | true |  |  |  |  | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  |  |  | Jan. 01, 2024 |  |  |  |  | Jan. 01, 2024 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current deferred costs related to prepaid and other assets |  |  |  |  | 2,100,000 |  |  |  | $ 2,200,000 |  | 2,100,000 |  |  |  |  |
Other Non-Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized implementation costs |  |  |  |  | $ 300,000 |  |  |  | 100,000 |  | 300,000 |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | 100,000 |  | 5,900,000 |  | 3,900,000 |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | $ 10,412,000 |  | 10,701,000 |  | $ 20,844,000 |  |  |
Wells Fargo Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio |  |  |  |  |  |  |  |  | 0.0325 | 0.0325 |  |  |  |  |  |
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] | 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] | Acorn HoldCo, Inc., [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for future borrowings |  |  |  |  |  |  |  |  | $ 180,800,000 |  |  |  |  |  |  |
Credit agreement current borrowing capacity |  |  |  |  |  |  |  |  | $ 56,100,000 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maintenance service periods |  |  |  |  |  |  |  |  | 1 month | 1 month |  |  |  |  |  |
Maintenance contract period |  |  |  |  |  |  |  |  | 1 month | 1 month |  |  |  |  |  |
Minimum [Member] | Building and Land Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |  |  | 5 years |  |
Minimum [Member] | Office Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
Minimum [Member] | Engineering Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
Minimum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
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 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maintenance service periods |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |
Maintenance contract period |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |
Maximum [Member] | Other Non-Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current deferred costs related to other non-current assets |  |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  | $ 100,000 |  |  |  |  |
Maximum [Member] | Building and Land Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 39 years |  |  |  |  | 39 years |  |
Maximum [Member] | Office Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 7 years |  |  |  |  | 7 years |  |
Maximum [Member] | Engineering Machinery and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 7 years |  |  |  |  | 7 years |  |
Maximum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |  |  | 5 years |  |
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 |  |  |  |  |  |
Adtran Networks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares tendered | shares |  |  |  |  |  |  |  |  | 831,000 | 831,000 | 67,000 | 67,000 |  |  |  |
Exit compensation payments |  |  |  |  |  |  |  |  | $ 17,400,000 | € 15.7 | $ 1,300,000 | € 1.2 |  |  |  |
Equity ownership percentage |  |  |  |  | 34.70% |  |  |  | 33.00% |  | 34.70% |  |  | 33.00% |  |
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 |  |  |  |  |  |  |  |
Adtran Networks [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized to purchase | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,346,544 |

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