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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 2,914 |  | $ 2,786 |
Interest and other debt costs | 7,547 |  | 15,146 |
Loss before income taxes | (5,385) |  | (41,093) |
Tax effect | 5,797 |  | 9,118 |
Net loss attributable to Tidewater Inc. | (10,940) |  | (50,112) |
Predecessor |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net |  | $ 1,680 |  | $ 3,268
Interest and other debt costs |  | 10,605 |  | 31,613
Loss before income taxes |  | (524,115) |  | (609,370)
Tax effect |  | 295 |  | 2,012
Net loss attributable to Tidewater Inc. |  | (524,434) |  | (619,289)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loss before income taxes | 43 |  | 404 |
Net loss attributable to Tidewater Inc. | 43 |  | 404 |
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 43 |  | $ 404 |
Reclassification out of Accumulated Other Comprehensive Income | Predecessor |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loss before income taxes |  | 80 |  | 2,545
Tax effect |  |  |  | 1,027
Net loss attributable to Tidewater Inc. |  | 80 |  | 1,518
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net |  | $ 80 |  | 405
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest and other debt costs |  |  |  | $ 2,140

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