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Selected Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 160,749 [1] $ 129,215 [1] $ 143,722 [1] $ 167,925 [1] $ 184,174 $ 218,191 $ 271,923 $ 304,774 $ 601,611 $ 979,062 $ 1,495,517
Operating income (loss) (69,340) [2] (287,034) [2] (155,344) [2] (66,135) [2] (56,569) [2] (9,400) [2] (17,644) [2] 14,089 [2] (577,853) (69,524) (37,181)
Net loss attributable to Tidewater Inc. $ (94,855) $ (297,676) $ (178,490) $ (89,097) $ (81,787) $ (19,509) $ (43,835) $ (15,052) $ (660,118) $ (160,183) $ (65,190)
Basic loss per share attributable to Tidewater Inc. $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (1.74) $ (0.42) $ (0.93) $ (0.32) $ (14.02) [3] $ (3.41) [3] $ (1.34) [3]
Diluted loss per share attributable to Tidewater Inc. $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (1.74) $ (0.42) $ (0.93) $ (0.32) $ (14.02) [4] $ (3.41) [4] $ (1.34) [4]
[1] Included in revenues for the fourth quarter is $39.1 million of revenue related to early cancellation of a long-term vessel charter contract.
[2] 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, by quarter for fiscal 2017 and 2016, are as follows:
[3] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[4] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.