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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 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
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, 2019
Dec. 31, 2018
Income Statement [Abstract]                                
Revenues                         $ 151,369 $ 178,753 $ 486,549 $ 406,520
Operating loss $ (38,674) $ (5,782) $ (50,039) $ (22,551) $ (4,394) $ (9,620) $ (70,077) $ (25,086) $ (140) $ (12,194) $ (18,091) $ (205,374) (244,048) (23,873) (86,604) (107,497)
Loss before income taxes                         (1,648,143) (36,687) (113,495) (153,519)
Income tax (benefit) expense                         (1,234) 2,039 27,724 18,252
Net loss attributable to Tidewater Inc. $ (1,122,475) $ (15,693) $ (59,853) $ (44,200) $ (15,959) $ (21,731) $ (90,509) $ (30,896) $ (10,940) $ (39,172) $ (23,573) $ (524,434) $ (1,646,909) $ (39,266) $ (141,743) $ (171,517)
Basic loss per common share $ (23.82) $ (0.81) $ (1.52) $ (1.15) $ (0.42) $ (0.58) $ (2.83) $ (1.16) $ (0.44) $ (1.67) $ (1.02) $ (11.13) $ (34.95) $ (1.82) $ (3.71) $ (6.45)
Diluted loss per common share $ (23.82) $ (0.81) $ (1.52) $ (1.15) $ (0.42) $ (0.58) $ (2.83) $ (1.16) $ (0.44) $ (1.67) $ (1.02) $ (11.13) $ (34.95) $ (1.82) $ (3.71) $ (6.45)
Weighted average common shares outstanding [1]                         47,121,330 21,539,143 38,204,934 26,589,883
Weighted average common stock and equivalents                         47,121,330 21,539,143 38,204,934 26,589,883
[1] Basic weighted average shares outstanding included 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2017 (Successor).