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Schedule of Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Transition Period Comparative Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 74,300 |  | $ 104,453 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 178,753 |  |  |  |
Operating loss |  |  |  | (5,782) | [1] | (18,091) | [1] |  |  |  |  |  |  |  |  |  |  |  |  | (23,873) |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,687) |  |  |  |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,039 |  |  |  |
Net loss attributable to Tidewater Inc. |  |  |  | $ (15,693) |  | $ (23,573) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (39,266) |  |  |  |
Basic loss per common share |  |  |  | $ (0.81) |  | $ (1.02) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.82) | [2] |  |  |
Diluted loss per common share |  |  |  | $ (0.81) |  | $ (1.02) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.82) | [3] |  |  |
Weighted average common shares outstanding | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,539,143 |  |  |  |
Dilutive effect of stock options and restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Adjusted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,539,143 |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition Period Comparative Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 36,263 |  |  |  |  |  | $ 115,106 |  | $ 160,749 | [1],[5] | $ 129,215 | [1],[5] | $ 143,722 | [1],[5] | $ 167,925 | [1],[5] | $ 151,369 |  |  |  | $ 440,862 |  |
Operating loss |  | (38,674) | [1] |  |  |  |  | (205,374) | [1] | (69,340) | [1],[5] | (287,034) | [1],[5] | (155,344) | [1],[5] | (66,135) | [1],[5] | (244,048) |  |  |  | (508,513) | $ (577,853) |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,648,143) |  |  |  | (558,359) | (643,614) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,234) |  |  |  | 4,680 | 6,397 |
Net loss attributable to Tidewater Inc. |  | $ (1,122,475) |  |  |  |  |  | $ (524,434) |  | $ (94,855) |  | $ (297,676) |  | $ (178,490) |  | $ (89,097) |  | $ (1,646,909) |  |  |  | $ (565,263) | $ (660,118) |
Basic loss per common share |  | $ (23.82) |  |  |  |  |  | $ (11.13) |  | $ (2.01) |  | $ (6.32) |  | $ (3.79) |  | $ (1.89) |  | $ (34.95) | [2] |  |  | $ (12.01) | $ (14.02) | [2]
Diluted loss per common share |  | $ (23.82) |  |  |  |  |  | $ (11.13) |  | $ (2.01) |  | $ (6.32) |  | $ (3.79) |  | $ (1.89) |  | $ (34.95) | [3] |  |  | $ (12.01) | $ (14.02) | [3]
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,121,330 | [4] |  |  | 47,067,887 | 47,071,066 | [4]
Dilutive effect of stock options and restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 | 0 |
Adjusted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,121,330 |  |  |  | 47,067,887 | 47,071,066 |
[1] | Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, restructuring charges, asset impairments, general and administrative expenses and gain on asset dispositions, net, of Tidewater's operations. Asset impairments, net, are as follows:
[2] | The Company calculates "Loss per share, basic" by dividing "Net loss available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[3] | The Company calculates "Loss per share, diluted" by dividing "Net loss available to common shareholders" by "Weighted average common stock and equivalents".
[4] | Basic weighted average shares outstanding includes 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2017 (Successor).
[5] | For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.

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