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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest income and other, net | $ 2,470 | $ (128)
Tax effect | 5,830 | 3,321
Net loss attributable to Tidewater Inc. | $ (21,731) | (39,172)
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net loss attributable to Tidewater Inc. |  | 361
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available for Sale Securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest income and other, net |  | $ 361

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