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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | SCHEDULE II TIDEWATER INC. AND SUBSIDIARIES Valuation and Qualifying Accounts (In thousands)
Description |  | Balance at Beginning of period |  |  | Additions at Cost |  |  | Deductions |  |  | Balance at End of Period |
Year Ended March 31, 2017 (Predecessor) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from Trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 11,450 |  |  |  | 5,348 |  |  |  | 633 |  |  |  | 16,165 |
Period from April 1, 2017 through July 31, 2017 (Predecessor) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from Trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 16,165 |  |  |  | — |  |  |  | 16,165 | (A) |  |  | — |
Period from August 1, 2017 through December 31, 2017 (Successor) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from Trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | — |  |  |  | 1,800 |  |  |  | — |  |  |  | 1,800 |
(A) | Approximately $15.4 million was deducted from the allowance for doubtful accounts in conjunction with the application of fresh-start accounting upon emergence from Chapter 11 bankruptcy.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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