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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 | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2016 USD ($) Vessel | Mar. 31, 2015 USD ($) Vessel | Mar. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Vessel revenues |  |  |  | $ 955,400 | $ 1,468,358 | $ 1,418,461
Due from affiliate |  |  |  | $ 338,595 | $ 420,365 |
Number of vessels operating | Vessel |  |  |  | 253 | 263 |
Investments in, at equity, and advances to unconsolidated companies |  |  |  | $ 37,502 | $ 65,844 | $ 63,928
Due to affiliate |  |  |  | 187,971 | 185,657 |
Commissions payable |  |  |  | $ 7,193 | 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% |  |
Agreement expiration date |  |  |  | 2015-11 |  |
Foreign receipt, exposure to risk, description |  |  |  | If the company is unable to reach agreement on a new split billing 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 split billing arrangements entered into with customers prior to the expiration of the consortium agreement remain in force. |  |
Proceeds from dividends received |  | $ 15,000 | $ 10,000 |  |  |
Due from affiliate and due to affiliate |  |  |  | $ 84,000 |  |
Due from affiliate |  |  |  | 339,000 | 420,000 |
Unpaid vessel revenue |  |  |  | $ 97,000 |  |
Number of vessels operating | Vessel |  |  |  | 8 |  |
Number of vessels stacked | Vessel |  |  |  | 3 |  |
Investments in, at equity, and advances to unconsolidated companies |  |  |  | $ 37,000 | 67,000 |
Due to affiliate |  |  |  | 188,000 | 186,000 |
Commissions payable |  |  |  | $ 32,000 | 66,000 |
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 | U.S Dollar Denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  |  |  | $ 3,000 |  |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  |  |  | 119,000 |  |
Sonatide joint venture | U.S. dollars initially received by Sonatide on behalf of the company or dollars collected from other customers |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  |  |  | 122,000 | 159,000 |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  |  |  | $ 93,000 | 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 |  |  |  | $ 215,000 | 338,000 |
Vessel revenues |  |  |  | $ 213,000 | $ 351,000 |
Percentage of Angolan operation revenue |  |  |  | 22.00% | 23.00% |
Number of vessels operating | Vessel |  |  |  | 65 | 80 |
Number of vessels stacked | Vessel |  |  |  | 8 | 8 |
Number of vessels transferred out of Angola | Vessel |  |  |  | 23 |  |

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