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Note 12 - Properties and Equipment, Accrued Costs and Expenses, Other Current Liabilities and Other Liabilities (Details Textual) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Number of Vessels | 146 | 146 |  |  |  |
Number of Vessels, Held for Sale | 24 | 24 | 46 | 46 | 38 | 46
Depreciation, Total |  | $ 53,614 | $ 57,629 |  |  |
Salvage Value [Member] |  |  |  |  |  |
Depreciation, Total | $ 3,800 |  |  |  |  |
Depreciation, Per Share (in dollars per share) | $ / shares | $ 0.09 |  |  |  |  |

X
- Definition The amount of depreciation expense per share. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of vessels. + References No definition available. + Details
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Balance Type: | na
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- Definition The number of vessels classified as held for sale. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Details
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