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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, 2016 USD ($) Vessel | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) Vessel | Mar. 31, 2016 USD ($) Vessel
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Vessel revenues |  |  | $ 162,430 |  | $ 298,313 |
Due from affiliate |  |  | 341,966 |  |  | $ 338,595
Investments in, at equity, and advances to unconsolidated companies |  |  | 36,989 |  |  | 37,502
Due to affiliate |  |  | 197,289 |  |  | 187,971
Commissions payable | [1] |  | $ 6,840 |  |  | 7,193
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. |  |  |
Due from affiliate and due to affiliate |  |  | $ 13,000 |  |  | 84,000
Proceeds from dividends received |  |  |  | $ 15,000 |  |
Due from affiliate |  |  | 342,000 |  |  | 339,000
Unpaid vessel revenue |  |  | $ 95,000 |  |  |
Number of vessels operating | Vessel |  |  | 8 |  |  |
Number of vessels stacked | Vessel |  |  | 4 |  |  |
Investments in, at equity, and advances to unconsolidated companies |  |  | $ 37,000 |  |  | 37,000
Due to affiliate |  |  | 197,000 |  |  | 188,000
Commissions payable |  |  | $ 52,000 |  |  | 32,000
Additional percentage of surcharges on foreign exchange transactions |  |  | 10.00% |  |  |
Percentage of tax valued on all debit transactions |  |  | 0.10% |  |  |
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 |  |  | $ 117,000 |  |  |
Sonatide joint venture | U.S Dollar Denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  |  | 3,000 |  |  |
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 |  |  | 16,000 |  |  | 122,000
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  |  | $ 11,000 |  |  | 93,000
Sonatide joint venture | ANGOLA |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Ownership percentage requirement of local vessel operators |  |  | 100.00% |  |  |
Proceeds from related party |  |  | $ 27,000 |  |  | 215,000
Vessel revenues |  |  | $ 39,000 |  | $ 68,000 | $ 213,000
Percentage of Angolan operation revenue |  |  | 24.00% |  | 23.00% |
Number of vessels operating | Vessel |  |  | 60 |  | 70 |
Number of vessels stacked | Vessel |  |  | 16 |  | 7 |
Number of vessels transferred out of Angola | Vessel |  |  | 13 |  |  | 23
[1] | Excludes $51.8 million and $31.6 million of commissions due to Sonatide at June 30, 2016 and March 31, 2016, respectively. These amounts are included in amounts due to affiliate.

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