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v3.19.3.a.u2

Investment in Unconsolidated Companies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2019 USD ($) Vessel | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) Vessel | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Vessel | Jun. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) Vessel | Jul. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2017 USD ($) Vessel | Dec. 31, 2019 USD ($) Vessel | Dec. 31, 2018 USD ($) Vessel | Mar. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from affiliate |  | $ 125,972 |  | $ 132,951 |  |  |  |  |  |  |  |  |  | $ 125,972 | $ 132,951 |
Impairments Charges | $ 21,325 | 32,549 | $ 5,224 | 36,878 | $ 16,853 | $ 1,215 | $ 6,186 | $ 16,777 | $ 163,423 |  | $ 184,748 |  | $ 16,777 | 37,773 | 61,132 |
Due to affiliate |  | $ 50,186 |  | 34,972 |  |  |  |  |  |  |  |  |  | 50,186 | 34,972 |
Total revenues |  |  |  |  |  |  |  |  |  |  | 151,369 |  | 178,753 | $ 486,549 | 406,520 |
Sonatide Marine, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in unconsolidated affiliates |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |
Due from affiliate | 252,393 | $ 89,246 |  | 109,176 |  |  |  | 230,315 |  | $ 252,393 | 252,393 | $ 230,315 | 230,315 | $ 89,246 | 109,176 | $ 262,652
Cash |  | 49,200 |  |  |  |  |  |  |  |  |  |  |  | 49,200 |  |
Working capital to satisfy net due from affiliate |  | 58,000 |  |  |  |  |  |  |  |  |  |  |  | 58,000 |  |
Impairments Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Due to affiliate | $ 123,899 | $ 31,475 |  | $ 29,347 |  |  |  | $ 99,448 |  | $ 123,899 | $ 123,899 | $ 99,448 | $ 99,448 | $ 31,475 | $ 29,347 | $ 132,857
Number of vessels operating | Vessel |  | 4 |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Number of vessels stacked | Vessel |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Sonatide Marine, Ltd. | ANGOLA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels operating | Vessel | 50 | 32 |  | 37 |  |  |  | 43 |  | 50 | 50 | 43 | 43 | 32 | 37 |
Number of vessels stacked | Vessel |  |  |  |  |  |  |  |  |  | 21 |  | 16 |  | 13 | 16 |
Total revenues |  |  |  |  |  |  |  |  |  | $ 34,000 |  | $ 34,000 |  | $ 52,100 | $ 59,000 |
Percentage of Angolan operation revenue |  |  |  |  |  |  |  |  |  | 23.00% |  | 20.00% |  | 10.90% | 15.00% |
Sonatide Marine, Ltd. | Trade Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net trade accounts receivable |  | $ 8,800 |  |  |  |  |  |  |  |  |  |  |  | $ 8,800 |  |
Sonatide Marine, Ltd. | Angola, Kwanza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ 8,900 |  |  |  |  |  |  |  |  |  |  |  | $ 8,900 |  |
Maximum | Sonatide Marine Ltd and DTDW Holdings Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in unconsolidated affiliates |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |

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