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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Mar. 31, 2017
Transition Period Comparative Data [Line Items]                          
Revenues                   $ 178,753   $ 406,520  
Operating loss   $ (5,782) $ (70,077) $ (25,086) $ (140) $ (12,194) $ (18,091)     (23,873)   (107,497)  
Loss before income taxes                   (36,687)   (153,519)  
Income tax (benefit) expense                   2,039   18,252  
Net loss attributable to Tidewater Inc.   $ (15,693) $ (90,509) $ (30,896) $ (10,940) $ (39,172) $ (23,573)     $ (39,266)   $ (171,517)  
Basic loss per common share   $ (0.81) $ (2.83) $ (1.16) $ (0.44) $ (1.67) $ (1.02)     $ (1.82) [1]   $ (6.45) [1]  
Diluted loss per common share   $ (0.81) $ (2.83) $ (1.16) $ (0.44) $ (1.67) $ (1.02)     $ (1.82) [2]   $ (6.45) [2]  
Weighted average common shares outstanding [3]                   21,539,143   26,589,883  
Weighted average common stock and equivalents                   21,539,143   26,589,883  
Predecessor                          
Transition Period Comparative Data [Line Items]                          
Revenues                 $ 151,369   $ 440,862   $ 601,611
Operating loss $ (38,674)             $ (205,374) (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) $ (1,646,909)   $ (565,263)   $ (660,118)
Basic loss per common share $ (23.82)             $ (11.13) $ (34.95) [1]   $ (12.01)   $ (14.02) [1]
Diluted loss per common share $ (23.82)             $ (11.13) $ (34.95) [2]   $ (12.01)   $ (14.02) [2]
Weighted average common shares outstanding                 47,121,330 [3]   47,067,887   47,071,066 [3]
Weighted average common stock and equivalents                 47,121,330   47,067,887   47,071,066
[1] We calculate “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[2] We calculate “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.
[3] Basic weighted average shares outstanding included 2,547 and 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2018 (Successor) and December 31, 2017 (Successor).