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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
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.