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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gains on available for sale securities |  |  | $ 2,914 |  |  |  |  |  |  |  | $ 2,771 | $ 2,786 |  |  |
Interest rate swap |  |  | (7,547) |  |  |  |  |  |  |  | (13,009) | (15,146) |  |  |
Loss before income taxes |  |  | (5,385) |  |  |  |  |  |  |  | (36,687) | (41,093) |  |  |
Tax effect |  |  | 5,797 |  |  |  |  |  |  |  | 2,039 | 9,118 |  |  |
Net loss attributable to Tidewater Inc. |  | $ (15,693) | (10,940) | $ (23,573) |  |  |  |  |  |  | (39,266) | (50,112) |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss before income taxes |  |  | 43 |  |  |  |  |  |  |  | 169 | 404 |  |  |
Net loss attributable to Tidewater Inc. |  |  | 43 |  |  |  |  |  |  |  | 169 | 404 |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gains on available for sale securities |  |  |  |  |  |  |  |  |  |  | $ 169 |  |  |  |
Realized gains on available for sale securities |  |  | $ 43 |  |  |  |  |  |  |  |  | $ 404 |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gains on available for sale securities |  |  |  |  | $ 1,680 |  |  |  |  | $ 2,384 |  |  | $ 3,268 |  | $ 5,193
Interest rate swap |  |  |  |  | (10,605) |  |  |  |  | (11,179) |  |  | (31,613) |  | (75,026)
Loss before income taxes |  |  |  |  | (524,115) |  |  |  |  | (1,648,143) |  |  | (609,370) | $ (558,359) | (643,614)
Tax effect |  |  |  |  | 295 |  |  |  |  | (1,234) |  |  | 2,012 | 4,680 | 6,397
Net loss attributable to Tidewater Inc. | $ (1,122,475) |  |  |  | (524,434) | $ (94,855) | $ (297,676) | $ (178,490) | $ (89,097) | (1,646,909) |  |  | (619,289) | $ (565,263) | (660,118)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss before income taxes |  |  |  |  | 80 |  |  |  |  | 106 |  |  | 2,545 |  | 2,935
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | 1,027 |  | 1,027
Net loss attributable to Tidewater Inc. |  |  |  |  | 80 |  |  |  |  | 106 |  |  | 1,518 |  | 1,908
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gains on available for sale securities |  |  |  |  |  |  |  |  |  | $ 106 |  |  |  |  | 582
Realized gains on available for sale securities |  |  |  |  | $ 80 |  |  |  |  |  |  |  | 405 |  |
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,140 |  | $ 2,353

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