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Business Combination - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2022 USD ($) $ / shares shares | Aug. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Aug. 30, 2021 € / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Exchange offer settled date | Jul. 15, 2022 |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 77,619,000 |  | 77,619,000 |  | 49,063,000 |
Common stock, reserved for future issuance | shares | 28,000,000.0 | 27,994,595 |  |  |  |  |  | 27,994,595
Goodwill |  |  | $ 357,869 |  | $ 357,869 |  | $ 6,968 |
Net revenue |  |  | 340,709 | $ 138,081 | 667,265 | $ 408,846 |  |
Net loss attributable to ADTRAN Holdings, Inc. |  |  | (41,934) | (10,427) | (40,918) | (4,445) |  |
Net loss attributable to non-controlling interest |  |  | (2,925) |  | (2,925) |  |  |
Network Solutions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | 270,916 |  | 270,916 |  | 6,568 |
Net revenue |  |  | 304,940 | 120,767 | 599,306 | 360,025 |  |
Services & Support [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | 86,953 |  | 86,953 |  | $ 400 |
Net revenue |  |  | 35,769 | 17,314 | 67,959 | 48,821 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of common stock exchanged |  | 64.00% |  |  |  |  |  |
ADVA Optical Networking SE [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business combination date of agreement |  | Aug. 30, 2021 |  |  |  |  |  |
Common stock, shares outstanding | shares |  | 33,957,538 |  |  |  |  |  | 33,957,538
Percentage of outstanding bearer shares |  | 65.43% |  |  |  |  |  |
Fair value of stock options assumed |  | $ 12,800 |  |  |  |  |  |
Goodwill | $ 359,157 |  | 359,200 |  | 359,200 |  |  |
Accounts receivable | 114,659 |  |  |  |  |  |  |
Other receivables | 1,457 |  |  |  |  |  |  |
Unpaid principal balance of account receivable | 118,500 |  |  |  |  |  |  |
Unpaid principal balance of other receivable | 1,500 |  |  |  |  |  |  |
Fair value of noncontrolling interest | 316,415 |  |  |  |  |  |  |
Net revenue | 163,800 |  |  |  |  |  |  |
Net loss attributable to ADTRAN Holdings, Inc. | $ 8,400 |  |  |  |  |  |  |
Net loss attributable to non-controlling interest |  |  | (2,900) |  | (2,900) |  |  |
Shares held by noncontrolling interest | shares |  | 17,941,496 |  |  |  |  |  | 17,941,496
Closing share price | (per share) | $ 20.20 | $ 17.64 |  |  |  |  |  | € 17.58
Currency conversion rate | 1.00318 |  |  |  |  |  |  |
ADVA Optical Networking SE [Member] | Selling, General and Administrative Expense [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Transaction costs incurred |  |  |  |  | 25,200 |  |  |
Transaction costs related to the business combination |  |  | $ 10,600 | $ 5,100 | 13,300 | $ 6,400 |  |
Estimated additional transaction costs to be incurred |  |  |  |  | $ 1,100 |  |  |
ADVA Optical Networking SE [Member] | Network Solutions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 270,600 |  |  |  |  |  |  |
ADVA Optical Networking SE [Member] | Services & Support [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 88,600 |  |  |  |  |  |  |
ADVA Optical Networking SE [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares issuable for each share of acquired entity | shares |  | 0.8244 |  |  |  |  |  |
Percentage of common stock exchanged |  | 36.00% |  |  |  |  |  |

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