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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) Vessel Kz / $ | Jun. 30, 2018 USD ($) Vessel Kz / $ | Jun. 30, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Kz / $ | Jun. 30, 2014 Vessel
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Due from affiliates |  | $ 197,059,000 | $ 197,059,000 |  | $ 230,315,000 |
Cash and cash equivalents |  | 459,286,000 | 459,286,000 |  | 432,035,000 |
Due to affiliates |  | 62,353,000 | 62,353,000 |  | 99,448,000 |
Commissions payable | [1] | 2,488,000 | 2,488,000 |  | 1,898,000 |
Total revenues |  | 105,601,000 | 197,094,000 |  |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 1,335,000 | 1,335,000 |  | $ 29,216,000 |
Dividend received in excess of investment |  |  | $ 4,900,000 |  |  |
Devaluation Of Angolan kwanza Versus US Dollar |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Foreign currency exchange rate | Kz / $ |  | 250 | 250 |  | 168 |
Percentage of devaluation of currency |  |  | 49.00% |  |  |
Percentage of foreign exchange loss recognized |  |  | 49.00% |  |  |
Estimated exchange loss |  |  | $ 20,600,000 |  |  |
Vessel Revenues |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Total revenues |  | $ 104,174,000 | $ 191,668,000 |  |  |
ANGOLA |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Number of vessels operating | Vessel |  | 37 | 37 |  |  | 84
Decrease in number of vessels operating | Vessel |  | 47 | 47 |  |  |
Decrease in number of active vessels | Vessel |  | 58 | 58 |  |  |
Number of active vessels | Vessel |  | 22 | 22 |  |  | 80
Sonatide joint venture |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Due from affiliates |  | $ 153,000,000 | $ 153,000,000 |  | $ 230,000,000 |
Unpaid vessel revenue |  | 25,000,000 | 25,000,000 |  |  |
Due to affiliates |  | 47,000,000 | 47,000,000 |  | 99,000,000 |
Commissions payable |  | $ 30,200,000 | 30,200,000 |  | 36,400,000 |
Due from affiliates and due to affiliates |  |  | $ 55,000,000 |  |  |
Number of vessels operating | Vessel |  | 7 | 7 |  |  |
Number of vessels stacked | Vessel |  | 5 | 5 |  |  |
Ownership Interest In Joint Venture |  | 49.00% | 49.00% |  |  |
Investments in, at equity, and advances to unconsolidated companies |  | $ 0 | $ 0 |  | $ 27,000,000 |
Dividend received |  |  | 12,300,000 |  |  |
Sonatide joint venture | ANGOLA |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  |  | $ 51,000,000 |  |  |
Percentage of Angolan operation revenue |  |  | 15.00% | 20.00% |  |
Number of vessels operating | Vessel |  | 38 | 38 | 53 |  |
Number of vessels stacked | Vessel |  | 17 | 17 | 23 |  |
Number of vessels transferred out of Angola | Vessel |  |  | 8 |  |  |
Sonatide joint venture | ANGOLA | Vessel Revenues |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Total revenues |  |  | $ 29,000,000 | $ 53,000,000 |  |
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 |  |  | 47,000,000 |  |  |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Proceeds from related party |  |  | 4,000,000 |  |  |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Bank deposits maintained |  | $ 67,000,000 | 67,000,000 |  |  |
Cash and cash equivalents |  | $ 43,000,000 | $ 43,000,000 |  |  |
[1] | Excludes $30.2 million and $36.4 million of commissions due to Sonatide at June 30, 2018 and December 31, 2017,

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