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(Loss) Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Summary of Calculations of Basic and Diluted (Loss) Earnings Per Share | The calculations of basic and diluted (loss) earnings per share for the years ended December 31, 2022, 2021 and 2020 are as follows:
(In thousands, except for per share amounts) |  | 2022 |  |  | 2021 |  |  | 2020 |
Numerator |  |  |  |  |  |  |  |  |
Net (Loss) Income attributable to ADTRAN Holdings, Inc. |  | $ | (2,037 | ) |  | $ | (8,635 | ) |  | $ | 2,378 |
Denominator |  |  |  |  |  |  |  |  |
Weighted average number of shares – basic |  |  | 62,346 |  |  |  | 48,582 |  |  |  | 47,996 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
PSUs, RSUs and restricted stock |  |  | — |  |  |  | — |  |  |  | 292 |
Weighted average number of shares – diluted |  |  | 62,346 |  |  |  | 48,582 |  |  |  | 48,288 |
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. – basic |  | $ | (0.03 | ) |  | $ | (0.18 | ) |  | $ | 0.05 |
(Loss) earnings per share attributable to ADTRAN Holdings, Inc. – diluted |  | $ | (0.03 | ) |  | $ | (0.18 | ) |  | $ | 0.05 |

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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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