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Selected 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
Quarterly Financial Data [Line Items]                        
Revenues   $ 74,300 $ 104,453             $ 178,753    
Operating income (loss)   (5,782) [1] (18,091) [1]             (23,873)    
Net loss attributable to Tidewater Inc.   $ (15,693) $ (23,573)             $ (39,266)    
Basic loss per share attributable to Tidewater Inc.   $ (0.81) $ (1.02)             $ (1.82) [2]    
Diluted loss per share attributable to Tidewater Inc.   $ (0.81) $ (1.02)             $ (1.82) [3]    
Predecessor                        
Quarterly Financial Data [Line Items]                        
Revenues $ 36,263     $ 115,106 $ 160,749 [4] $ 129,215 [4] $ 143,722 [4] $ 167,925 [4] $ 151,369   $ 440,862 $ 601,611
Operating income (loss) (38,674) [1]     (205,374) [1] (69,340) [1] (287,034) [1] (155,344) [1] (66,135) [1] (244,048)   (508,513) (577,853)
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 share attributable to Tidewater Inc. $ (23.82)     $ (11.13) $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (34.95) [2]   $ (12.01) $ (14.02) [2]
Diluted loss per share attributable to Tidewater Inc. $ (23.82)     $ (11.13) $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (34.95) [3]   $ (12.01) $ (14.02) [3]
[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 the company’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] Included in revenues for the quarter ended March 31, 2017 is $39.1 million of revenue related to early cancellation of a long-term vessel charter contract