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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) Vessel | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Vessel | Jun. 30, 2018 USD ($) Vessel | Jun. 30, 2017 USD ($) Vessel | Mar. 31, 2017 USD ($) | Jun. 30, 2014 Vessel
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Due from affiliate |  |  | $ 197,059 |  | $ 230,315 | $ 197,059 |  |  |
Due to affiliate |  |  | 62,353 |  | 99,448 | 62,353 |  |  |
Commissions payable | [1] |  | 2,488 |  | 1,898 | 2,488 |  |  |
Total revenues |  |  | 105,601 |  | 178,753 | 197,094 |  |  |
Investments in, at equity, and advances to unconsolidated companies |  |  | 1,335 |  | 29,216 | 1,335 |  |  |
Cash and cash equivalents |  |  | 459,286 |  | $ 432,035 | 459,286 |  |  |
Number of vessels operating | Vessel | [2] |  |  |  | 227 |  |  |  |
Dividend received in excess of investment |  |  |  |  |  | 4,900 |  |  |
Vessel Revenues |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total revenues |  |  | $ 104,174 |  | $ 171,884 | $ 191,668 |  |  |
ANGOLA |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of vessels operating | Vessel |  |  | 37 |  |  | 37 |  |  | 84
Decrease in number of vessels operating | Vessel |  |  | 47 |  |  | 47 |  |  |
Number of active vessels | Vessel |  |  | 22 |  |  | 22 |  |  | 80
Decrease in number of active vessels | Vessel |  |  | 58 |  |  | 58 |  |  |
Devaluation Of Angolan kwanza Versus US Dollar |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency exchange rate |  |  | 250 |  | 168 | 250 |  |  |
Percentage of devaluation of currency |  |  |  |  |  | 49.00% |  |  |
Percentage of foreign exchange loss recognized |  |  |  |  |  | 49.00% |  |  |
Estimated exchange loss |  |  |  |  |  | $ 20,600 |  |  |
Sonatide joint venture |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Due from affiliate |  |  | $ 153,000 |  | $ 230,000 | 153,000 |  | $ 263,000 |
Unpaid vessel revenue |  |  | 25,000 |  | 44,000 | 25,000 |  |  |
Due to affiliate |  |  | 47,000 |  | 99,000 | 47,000 |  | 133,000 |
Commissions payable |  |  | $ 30,200 |  | 36,400 | 30,200 |  |  |
Due from affiliate and due to affiliate |  |  |  |  | $ 33,000 | $ 55,000 |  |  |
Ownership Interest In Joint Venture |  |  | 49.00% |  | 49.00% | 49.00% |  |  |
Investments in, at equity, and advances to unconsolidated companies |  |  | $ 0 |  | $ 27,000 | $ 0 |  | 45,000 |
Investment balance in difference between carrying value and net assets of the joint venture |  | $ 28,000 |  | $ 28,000 |  |  |  |  |
Amortization period of basis difference equity method investments |  | 10 years |  |  |  |  |  |  |
Dividend received |  |  |  |  |  | 12,300 |  |  |
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 |  |  |  | 19,000 | 20,000 | 47,000 |  |  |
Sonatide joint venture | Sonatide's converting kwanzas into dollars and subsequent payment to company |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from related party |  |  |  | 3,000 | 1,000 | 4,000 |  |  |
Sonatide joint venture | ANGOLA |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from related party |  |  |  | 22,000 | 21,000 | $ 51,000 |  |  |
Total revenues |  |  |  | $ 34,000 | $ 34,000 |  |  | $ 127,000 |
Percentage of Angolan operation revenue |  |  |  | 23.00% | 20.00% | 15.00% | 20.00% | 22.00% |
"Number of vessels transferred out of Angola | Vessel" |  |  |  | 3 | 3 | 8 |  | 22 |
Number of vessels operating | Vessel |  |  | 38 |  |  | 38 | 53 |  |
Number of vessels stacked | Vessel |  |  | 17 |  |  | 17 | 23 |  |
Sonatide joint venture | ANGOLA | Vessel Revenues |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  | $ 29,000 | $ 53,000 |  |
Sonatide joint venture | Angolan kwanza-denominated |  |  |  |  |  |  |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Bank deposits maintained |  |  | $ 67,000 |  | $ 81,000 | 67,000 |  |  |
Cash and cash equivalents |  |  | $ 43,000 |  |  | $ 43,000 |  |  |
[1] | Excludes $30.2 million and $36.4 million of commissions due to Sonatide at June 30, 2018 and December 31, 2017, respectively. These amounts are included in amounts due to affiliates.
[2] | Vessel count excludes vessels operated under sale leaseback agreements.

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