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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Consolidated Statement of Income (Detail) - USD ($) $ 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  |  | $ 2,771 |  | $ 11,294 |
Interest and debt costs incurred, net of interest capitalized |  |  |  |  |  |  |  |  |  | 13,009 |  | 30,439 |
Loss before income taxes |  |  |  |  |  |  |  |  |  | (36,687) |  | (153,519) |
Tax effect |  |  |  |  |  |  |  |  |  | 2,039 |  | 18,252 |
Net loss attributable to Tidewater Inc. |  | $ (15,693) | $ (90,509) | $ (30,896) | $ (10,940) | $ (39,172) | $ (23,573) |  |  | (39,266) |  | (171,517) |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  | $ 2,384 |  |  |  | $ 5,193
Interest and debt costs incurred, net of interest capitalized |  |  |  |  |  |  |  |  | 11,179 |  |  |  | 75,026
Loss before income taxes |  |  |  |  |  |  |  |  | (1,648,143) |  | $ (558,359) |  | (643,614)
Tax effect |  |  |  |  |  |  |  |  | (1,234) |  | 4,680 |  | 6,397
Net loss attributable to Tidewater Inc. | $ (1,122,475) |  |  |  |  |  |  | $ (524,434) | (1,646,909) |  | $ (565,263) |  | (660,118)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  |  | 169 |  | (1,132) |
Net loss attributable to Tidewater Inc. |  |  |  |  |  |  |  |  |  | 169 |  | (1,132) |
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 and debt costs incurred, net of interest capitalized |  |  |  |  |  |  |  |  |  | $ (169) |  | (404) |
Reclassification out of Accumulated Other Comprehensive Income | Retiree Medical Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  |  |  |  | $ (1,536) |
Reclassification out of Accumulated Other Comprehensive Income | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  | 106 |  |  |  | 2,935
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | 1,027
Net loss attributable to Tidewater Inc. |  |  |  |  |  |  |  |  | 106 |  |  |  | 1,908
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Realized Gains on Available for Sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and debt costs incurred, net of interest capitalized |  |  |  |  |  |  |  |  | $ (106) |  |  |  | (582)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and debt costs incurred, net of interest capitalized |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,353

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