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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, 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
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 74,300 | $ 110,234 | $ 99,192 | $ 105,601 | $ 91,493 | $ 104,453 |  |  |  |  |  |  |  |  |  |
Impairment of due from affiliate |  |  | (20,083) |  |  |  |  |  |  |  |  |  |  | $ (20,083) |  |  |
Asset impairments included in operating loss |  |  | (36,878) | (16,853) | (1,215) | (6,186) | (16,777) |  |  |  | $ (16,777) | [1] |  | (61,132) | [1] |  |
Operating income (loss) |  | (5,782) | (70,077) | (25,086) | (140) | (12,194) | (18,091) |  |  |  | (23,873) |  |  | (107,497) |  |  |
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 share attributable to Tidewater Inc. |  | $ (0.81) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) |  |  |  | $ (1.82) | [2] |  | $ (6.45) | [2] |  |
Diluted loss per share attributable to Tidewater Inc. |  | $ (0.81) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) |  |  |  | $ (1.82) | [3] |  | $ (6.45) | [3] |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 36,263 |  |  |  |  |  |  | $ 115,106 |  |  |  |  |  |  |  |  |
Asset impairments included in operating loss | (21,325) |  |  |  |  |  |  | (163,423) | $ (184,748) | [1] |  |  |  |  |  | $ (484,727) | [1]
Operating income (loss) | (38,674) |  |  |  |  |  |  | (205,374) | (244,048) |  |  |  | $ (508,513) |  |  | (577,853) |
Net loss attributable to Tidewater Inc. | $ (1,122,475) |  |  |  |  |  |  | $ (524,434) | $ (1,646,909) |  |  |  | $ (565,263) |  |  | $ (660,118) |
Basic loss per share attributable to Tidewater Inc. | $ (23.82) |  |  |  |  |  |  | $ (11.13) | $ (34.95) | [2] |  |  | $ (12.01) |  |  | $ (14.02) | [2]
Diluted loss per share attributable to Tidewater Inc. | $ (23.82) |  |  |  |  |  |  | $ (11.13) | $ (34.95) | [3] |  |  | $ (12.01) |  |  | $ (14.02) | [3]
[1] | The twelve months ended December 31, 2018, the period August 1, 2017 through December 31, 2017 and the twelve months ended March 31, 2017 included $3.5 million, $2.3 million and $2.2 million respectively, of impairments related to inventory and other non-vessel assets. There were no impairments to non-vessel assets during the period April 1, 2017 through July 31, 2017.
[2] | We calculate “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[3] | We calculate “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.

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