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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2013 | Dec. 31, 2015 USD ($) Vessel | Dec. 31, 2014 USD ($) Vessel | Dec. 31, 2015 USD ($) Vessel | Dec. 31, 2014 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Vessel revenues |  |  | $ 212,908 | $ 378,126 | $ 775,352 | $ 1,150,588 |
Other operating revenues |  |  | 5,283 | 9,428 | 19,536 | 20,167 |
Due from affiliate |  |  | 336,474 |  | 336,474 |  | $ 420,365
Investments in, at equity, and advances to unconsolidated companies |  |  | 45,663 |  | 45,663 |  | 65,844
Due to affiliate |  |  | 169,943 |  | 169,943 |  | 185,657
Commissions payable | [1] |  | $ 7,197 |  | $ 7,197 |  | 8,282
Sonatide joint venture |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Definitive joint venture agreement term |  | 2 years |  |  | 1 year |  |
Ownership Interest In Joint Venture |  |  | 49.00% |  | 49.00% |  |
Foreign receipt, exposure to risk, description |  |  |  |  | If the company is unable to reach agreement on a new split payment arrangement, any contract entered into after the expiration of the consortium agreement may result in the receipt of 100% Angolan kwanzas, which would be subject to the challenges and risks described above. The company believes that the split payment contracts entered into with customers prior to the expiration of the consortium agreement will remain in force until their expirations. |  |
Agreement expiration date |  |  |  |  | 2015-11 |  |
Proceeds from dividends received |  |  | $ 15,000 | $ 10,000 |  |  |
Other operating revenues |  |  |  |  | $ 10,000 |  |
Due from affiliate and due to affiliate |  |  |  |  | 65,000 |  |
Due from affiliate |  |  | $ 336,000 |  | $ 336,000 |  | 420,000
Number of vessels operating | Vessel |  |  | 8 |  | 8 |  |
Number of vessels stacked | Vessel |  |  | 3 |  | 3 |  |
Investments in, at equity, and advances to unconsolidated companies |  |  | $ 43,000 |  | $ 43,000 |  | 67,000
Due to affiliate |  |  | 170,000 |  | 170,000 |  | 186,000
Commissions payable |  |  | 27,000 |  | $ 27,000 |  | 66,000
Sonatide joint venture | Minimum |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Additional percentage of surcharges on foreign exchange transactions |  |  |  |  | 10.00% |  |
Sonatide joint venture | Maximum |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Expected time period to deliver the new build vessels |  |  |  |  | 2 years |  |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Bank deposits maintained |  |  | 95,000 |  | $ 95,000 |  |
Sonatide joint venture | U.S Dollar Denominated |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Bank deposits maintained |  |  | $ 1,000 |  | 1,000 |  |
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 |  |  |  |  | 93,000 |  | 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 |  |  |  |  | $ 89,000 |  | 179,000
Sonatide joint venture | ANGOLA |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |
Ownership percentage requirement of local vessel operators |  |  |  |  | 100.00% |  |
Proceeds from related party |  |  |  |  | $ 182,000 |  | 338,000
Vessel revenues |  |  |  |  | $ 172,000 | $ 271,000 | $ 351,000
Percentage of Angolan operation revenue |  |  |  |  | 22.00% | 23.00% |
Number of vessels operating | Vessel |  |  | 66 | 83 | 66 | 83 |
Number of vessels stacked | Vessel |  |  | 8 | 4 | 8 | 4 |
Number of vessels transferred out of Angola | Vessel |  |  |  |  |  |  | 13
Number of vessels stacked transferred | Vessel |  |  | 18 |  | 18 |  |
[1] | Excludes $27.3 million and $46.3 million of commissions due to Sonatide at December 31, 2015 and March 31, 2015, respectively. These amounts are included in amounts due to affiliate.

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