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Components of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common shareholders |  | $ (15,693) | $ (10,940) |  | $ (23,573) |  |  |  |  |  |  |  |  | $ (39,266) |  | $ (50,112) |  |  |  |  |  |
Weighted average outstanding shares of common stock, basic |  |  | 24,654,220 | [1] |  |  |  |  |  |  |  |  |  | 21,539,143 | [2] | 23,989,254 | [1] |  |  |  |  |
Dilutive effect of options, warrants and restricted stock awards and units |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Weighted average common stock and equivalents |  |  | 24,654,220 |  |  |  |  |  |  |  |  |  |  | 21,539,143 |  | 23,989,254 |  |  |  |  |  |
Loss per share, basic |  | $ (0.81) | $ (0.44) | [3] | $ (1.02) |  |  |  |  |  |  |  |  | $ (1.82) | [4] | $ (2.09) | [3] |  |  |  |  |
Loss per share, diluted |  | $ (0.81) | $ (0.44) | [5] | $ (1.02) |  |  |  |  |  |  |  |  | $ (1.82) | [6] | $ (2.09) | [5] |  |  |  |  |
In-the-money Options, Warrants and Restricted Stock Awards and Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period |  |  | 4,521,727 | [7] |  |  |  |  |  |  |  |  |  | 7,869,553 | [8] | 5,454,218 | [7] |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common shareholders | $ (1,122,475) |  |  |  |  | $ (524,434) |  | $ (94,855) | $ (297,676) | $ (178,490) | $ (89,097) | $ (1,646,909) |  |  |  |  |  | $ (619,289) |  | $ (565,263) | $ (660,118) |
Weighted average outstanding shares of common stock, basic |  |  |  |  |  | 47,121,304 | [1] |  |  |  |  | 47,121,330 | [2] |  |  |  |  | 47,101,155 | [1] | 47,067,887 | 47,071,066 | [2]
Dilutive effect of options, warrants and restricted stock awards and units |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 | 0 |
Weighted average common stock and equivalents |  |  |  |  |  | 47,121,304 |  |  |  |  |  | 47,121,330 |  |  |  |  |  | 47,101,155 |  | 47,067,887 | 47,071,066 |
Loss per share, basic | $ (23.82) |  |  |  |  | $ (11.13) | [3] | $ (2.01) | $ (6.32) | $ (3.79) | $ (1.89) | $ (34.95) | [4] |  |  |  |  | $ (13.15) | [3] | $ (12.01) | $ (14.02) | [4]
Loss per share, diluted | $ (23.82) |  |  |  |  | $ (11.13) | [5] | $ (2.01) | $ (6.32) | $ (3.79) | $ (1.89) | $ (34.95) | [6] |  |  |  |  | $ (13.15) | [5] | $ (12.01) | $ (14.02) | [6]
Predecessor | In-the-money Options, Warrants and Restricted Stock Awards and Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental "in-the-money" options, warrants and restricted stock awards and units at the end of the period |  |  |  |  |  | 183 | [7] |  |  |  |  |  |  |  |  |  |  | 183 | [7] |  | 1,233 | [8]
[1] | Common shares and new creditor warrants and the sum of common shares and New Creditor Warrants outstanding at June 30, 2018, were 26,085,274, 3,924,441 and 30,009,715, respectively.
[2] | 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).
[3] | Tidewater calculates "Loss per share, basic" by dividing "Net loss available to common shareholders" by "Weighted average outstanding shares of common stock, basic".
[4] | The Company calculates "Loss per share, basic" by dividing "Net loss available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[5] | Tidewater calculates "Loss per share, diluted" by dividing "Net loss available to common shareholders" by "Weighted average common stock and equivalents".
[6] | The Company calculates "Loss per share, diluted" by dividing "Net loss available to common shareholders" by "Weighted average common stock and equivalents".
[7] | For the six months ended June 30, 2018, Tidewater also had 5,062,089 shares of "out-of- the-money" warrants outstanding at the end of the period.
[8] | For the period from August 1, 2017 through December 31, 2017, the Company also had 5,062,089 shares of "out-of- the-money" warrants outstanding at the end of the period.

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