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Nature of Business - Additional Information (Detail) € in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2023 USD ($) | Jul. 18, 2022 USD ($) | Dec. 31, 2023 USD ($) IncentivePlan shares | Dec. 31, 2023 USD ($) IncentivePlan shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 EUR (€) IncentivePlan shares | Oct. 18, 2022 shares | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustment during period |  |  |  | $ (231,210,000) |  | $ (70,963,000) | $ (6,305,000) |  |  |
Cash, uninsured amount |  |  | $ 83,200,000 | $ 83,200,000 |  |  |  |  |  |
Percentage of guaranteed interest rate |  |  | 5.00% | 5.00% |  |  |  | 5.00% |  |
Percentage of guaranteed interest rate plus a variable component |  |  | 3.12% | 3.12% |  |  |  | 3.12% |  |
Aggregate exit compensation payments obligation including guaranteed interest |  |  | $ 342,500,000 | $ 342,500,000 |  |  |  | € 310.3 |  |
Expire date of exit compensation |  |  |  | Mar. 16, 2023 | Mar. 16, 2023 |  |  |  |  |
Annual recurring compensation obligation |  |  |  | $ 11,700,000 | € 10.6 |  |  |  |  |
Accrued annual recurring compensation obligation |  |  |  | $ 11,500,000 |  |  |  |  |  |
Number of shares tendered | shares |  |  |  | 67,000 | 67,000 |  |  |  |  |
Exit compensation payments |  |  |  | $ 1,300,000 | € 1.2 |  |  |  |  |
Asset impairments |  |  |  |  |  | 17,400,000 |  |  |  |
Impairment losses of long-lived assets |  |  |  | 0 |  |  | 0 |  |  |
Impairment losses of intangible assets |  |  |  | 0 |  | 0 | 0 |  |  |
Goodwill impairment | $ 0 |  | 0 | 37,874,000 |  | 0 | 0 |  |  |
Impairment charges related to capitalized implementation costs |  |  |  | $ 0 |  | 16,900,000 | 0 |  |  |
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 | $ 6,445,000 |  | 7,196,000 | 5,403,000 |  |  | $ 7,146,000
Non-current pension liability |  |  | $ 12,679,000 | $ 12,679,000 |  | 10,624,000 |  |  |  |
Number of stock incentive plans | IncentivePlan |  |  | 2 | 2 |  |  |  | 2 |  |
Goodwill |  |  | $ 353,415,000 | $ 353,415,000 |  | 381,724,000 |  |  |  |
Stock-based compensation expense |  |  |  | 16,016,000 |  | 28,322,000 | 7,480,000 |  |  |
Reduction of research and development expense recognized |  |  |  | 5,200,000 |  | 1,100,000 |  |  |  |
Research and development costs |  |  |  | 258,311,000 |  | 173,757,000 | 108,663,000 |  |  |
Effect on adoption of ASU |  |  | 123,020,000 | 123,020,000 |  | 110,699,000 |  |  |  |
Effect on adoption of ASU |  |  | 87,706,000 | 87,706,000 |  | 66,998,000 |  |  |  |
Tax benefit in other comprehensive (loss) income |  |  |  | (509,000) |  | 1,966,000 | 1,596,000 |  |  |
Cash and cash equivalents |  |  | 87,167,000 | 87,167,000 |  | 108,644,000 |  |  |  |
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 |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement [Member] | Credit Parties [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 50,000,000 |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement [Member] | Company and Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 75,000,000 |  |  |  |  |  |  |  |
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing capacity |  | $ 400,000,000 | 400,000,000 | 400,000,000 |  |  |  |  |  |
Available for future borrowings |  |  | 202,700,000 | 202,700,000 |  |  |  |  |  |
Credit agreement current borrowing capacity |  |  | 38,800,000 | 38,800,000 |  |  |  |  |  |
Services & Support [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  | 37,900,000 |  |  |  |  |  |
Goodwill |  |  | $ 56,384,000 | $ 56,384,000 |  | 83,444,000 |  |  |  |
Adtran Networks [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares tendered | shares |  |  |  | 67,000 | 67,000 |  |  |  |  |
Exit compensation payments |  |  |  | $ 1,300,000 | € 1.2 |  |  |  |  |
Goodwill |  |  |  |  |  | $ 350,500,000 |  |  |  |
Equity ownership percentage |  |  | 34.70% | 34.70% |  | 34.70% |  | 34.70% |  |
ASU 2021-08 [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true | true |  |  |  | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Jul. 01, 2022 | Jul. 01, 2022 |  |  |  | Jul. 01, 2022 |  |
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 | $ 2,100,000 |  | $ 1,500,000 |  |  |  |
Other Non-Current Assets [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized implementation costs |  |  | $ 300,000 | $ 300,000 |  | 6,200,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Maintenance service periods |  |  |  | 1 month | 1 month |  |  |  |  |
Maintenance contract period |  |  |  | 1 month | 1 month |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease, renewal term |  |  | 1 year | 1 year |  |  |  | 1 year |  |
Maintenance service periods |  |  |  | 5 years | 5 years |  |  |  |  |
Maintenance contract period |  |  |  | 5 years | 5 years |  |  |  |  |
Maximum [Member] | Adtran Networks [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized to purchase | shares |  |  | 15,346,544 | 15,346,544 |  |  |  | 15,346,544 | 15,346,544 |
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 |  |  |  |
Building and Land Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 5 years | 5 years |  |  |  | 5 years |  |
Building and Land Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 39 years | 39 years |  |  |  | 39 years |  |
Office Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 3 years | 3 years |  |  |  | 3 years |  |
Office Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 7 years | 7 years |  |  |  | 7 years |  |
Engineering Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 3 years | 3 years |  |  |  | 3 years |  |
Engineering Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 7 years | 7 years |  |  |  | 7 years |  |
Computer Software [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 3 years | 3 years |  |  |  | 3 years |  |
Computer Software [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  | 5 years | 5 years |  |  |  | 5 years |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  | $ 5,900,000 |  | 3,900,000 | 1,000,000 |  |  |
Stock-based compensation expense |  |  |  | $ 10,701,000 |  | $ 20,844,000 | $ 4,571,000 |  |  |

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