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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.