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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) Vessel Kz / $ | Mar. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Kz / $ | Mar. 31, 2014 Vessel
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Due from affiliate |  | $ 207,919 |  | $ 230,315 |
Cash and cash equivalents |  | 442,472 |  | 432,035 |
Due to affiliate |  | 78,135 |  | 99,448 |
Commissions payable | [1] | 2,146 |  | 1,898 |
Vessel revenues |  | 87,494 |  |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 13,503 |  | $ 29,216 |
Devaluation Of Angolan kwanza Versus US Dollar |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Foreign currency exchange rate | Kz / $ |  | 214 |  | 168 |
Percentage of devaluation of currency |  | 27.00% |  |  |
Percentage of foreign exchange loss recognized |  | 49.00% |  |  |
Estimated exchange loss |  | $ 14,800 |  |  |
ANGOLA |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Number of vessels operating | Vessel |  | 38 |  |  | 85
Decrease in number of vessels operating | Vessel |  | 47 |  |  |
Decrease in number of active vessels | Vessel |  | 58 |  |  |
Number of active vessels | Vessel |  | 21 |  |  | 79
Sonatide joint venture |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Due from affiliate |  | $ 208,000 |  | $ 230,000 |
Unpaid vessel revenue |  | 26,000 |  |  |
Due to affiliate |  | 78,000 |  | 99,000 |
Commissions payable |  | 37,600 |  | 36,400 |
Due from affiliate and due to affiliate |  | $ 27,000 |  |  |
Number of vessels operating | Vessel |  | 7 |  |  |
Number of vessels stacked | Vessel |  | 4 |  |  |
Ownership Interest In Joint Venture |  | 49.00% |  |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 12,000 |  | $ 27,000 |
Sonatide joint venture | ANGOLA |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Proceeds from related party |  | 8,000 |  |  |
Vessel revenues |  | $ 14,000 | $ 26,000 |  |
Percentage of Angolan operation revenue |  | 16.00% | 17.00% |  |
Number of vessels operating | Vessel |  | 40 | 55 |  |
Number of vessels stacked | Vessel |  | 18 | 24 |  |
Number of vessels transferred out of Angola | Vessel |  | 12 |  |  |
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 |  | $ 6,000 |  |  |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Proceeds from related party |  | 2,000 |  |  |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Bank deposits maintained |  | 103,000 |  |  |
Cash and cash equivalents |  | $ 66,000 |  |  |
[1] | Excludes $37.6 million and $36.4 million of commissions due to Sonatide at March 31, 2018 and December 31, 2017,

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