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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2013 | Jun. 30, 2015 USD ($) Vessel | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel | Mar. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Vessel revenues |  | $ 298,313 |  | $ 381,510 |  |
Other operating revenues |  | 6,461 |  | 4,167 |  |
Investments in, at equity, and advances to unconsolidated companies |  | 62,701 |  |  | $ 65,844 |
Commissions payable |  | $ 6,288 |  |  | 8,282 |
Minimum |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Additional percentage of surcharges on foreign exchange transactions |  | 10.00% |  |  |  |
Maximum |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Expected time period to deliver the new build vessels |  | 2 years |  |  |  |
Sonatide joint venture |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Definitive joint venture agreement term | 2 years |  |  |  |  |
Ownership Interest In Joint Venture |  | 49.00% |  |  |  |
Proceeds from related party |  |  |  |  | 338,000 |
Proceeds from dividends received |  |  | $ 10,000 |  |  |
Other operating revenues |  | $ 33,000 |  |  |  |
Due from related parties |  | $ 385,000 |  |  |  |
Number of vessels operating | Vessel |  | 8 |  |  |  |
Number of vessels stacked | Vessel |  | 2 |  |  |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 62,000 |  |  |  | $ 67,000
Sonatide joint venture | Dollars held by Sonatide that did not need to be converted to U.S dollars prior to payment to Tidewater |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  | 49,000 |  |  | 159,000 |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to Tidewater |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  | 52,000 |  |  | 179,000 |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  | 111,000 |  |  |  |
Sonatide joint venture | U.S Dollar Denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  | 30,000 |  |  |  |
Sonatide joint venture | ANGOLA |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  | 101,000 |  |  |  |
Vessel revenues |  | $ 68,000 |  | $ 87,000 | $ 351,000 |
Percentage of Angolan operation revenue |  | 23.00% |  | 23.00% |  |
Number of vessels operating | Vessel |  | 70 |  | 83 |  |
Number of vessels stacked | Vessel |  | 7 |  | 4 |  |
Ownership percentage requirement of local vessel operators |  | 100.00% |  |  |  |
Number of vessels transferred out of Angola | Vessel |  |  |  |  | 13 |
Number of vessels stacked transferred | Vessel |  | 4 |  |  |  |
Sonatide joint venture | Trade and other receivables |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Due from related parties |  | $ 385,000 |  |  | $ 420,000 |
Sonatide joint venture | Accrued expenses |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Due to related parties |  | 192,000 |  |  | 186,000 |
Commissions payable |  | $ 41,000 |  |  | $ 66,000 |

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