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Loss per Share (Tables) | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Summary of Calculation of Basic and Diluted Loss Per Share | The calculation of basic and diluted loss per share is as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
(In thousands, except per share amounts) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  |  |  |  | (Restated) |  |  |  |  |  | (Restated) |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to ADTRAN Holdings, Inc. |  | $ | (20,531 | ) |  | $ | (49,667 | ) |  | $ | (31,798 | ) |  | $ | (380,432 | )
Effect of redemption of RNCI |  |  | 1,494 |  |  |  | — |  |  |  | 1,491 |  |  |  | — |
Net loss attributable to ADTRAN Holdings, Inc. common stockholders |  | $ | (19,037 | ) |  | $ | (49,667 | ) |  | $ | (30,307 | ) |  | $ | (380,432 | )
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares – basic |  |  | 79,748 |  |  |  | 78,852 |  |  |  | 79,642 |  |  |  | 78,803 |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
PSUs, RSUs and restricted stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Weighted average number of shares – diluted |  |  | 79,748 |  |  |  | 78,852 |  |  |  | 79,642 |  |  |  | 78,803 |
Loss per share attributable to ADTRAN Holdings, Inc. – basic |  | $ | (0.24 | ) |  | $ | (0.63 | ) |  | $ | (0.38 | ) |  | $ | (4.83 | )
Loss per share attributable to ADTRAN Holdings, Inc. – diluted |  | $ | (0.24 | ) |  | $ | (0.63 | ) |  | $ | (0.38 | ) |  | $ | (4.83 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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