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TRANSITION PERIOD COMPARATIVE DATA (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Statement [Abstract] |
Schedule of Transition Period Comparable Data | The following table presents certain financial information for the nine-month periods ended December 31, 2017:
|  | Successor |  |  |  | Predecessor
|  | Period from |  |  |  | Period from |  |
|  | August 1, 2017 |  |  |  | April 1, 2017 |  |
|  | through |  |  |  | through |  |
(In thousands, except share and per share data) |  | December 31, 2017 |  |  |  | July 31, 2017 |  |
Revenues |  | $ | 178,753 |  |  |  |  | 151,369 |  |
Operating loss |  |  | (23,873 | ) |  |  |  | (244,048 | ) |
Loss before income taxes |  |  | (36,687 | ) |  |  |  | (1,648,143 | ) |
Income tax (benefit) expense |  |  | 2,039 |  |  |  |  | (1,234 | ) |
Net loss attributable to Tidewater Inc. |  |  | (39,266 | ) |  |  |  | (1,646,909 | ) |
Basic loss per common share |  |  | (1.82 | ) |  |  |  | (34.95 | ) |
Diluted loss per common share |  |  | (1.82 | ) |  |  |  | (34.95 | ) |
Weighted average common shares outstanding |  |  | 21,539,143 |  |  |  |  | 47,121,330 |  |
Dilutive effect of stock options and restricted stock |  |  | — |  |  |  |  | — |  |
Adjusted average common shares outstanding |  |  | 21,539,143 |  |  |  |  | 47,121,330 |  |

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