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Affiliates Balances - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 22, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) Vessel
Schedule of Equity Method Investments [Line Items] |  |  |  |
Dividend received by Sonangol company |  | $ 17,100 |  |
Affiliate credit loss impairment expense |  |  | $ 53,581 | $ 53,581
Sonatide Marine, Ltd. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Due from affiliate current net after offsetting due to affiliate | $ 17,000 |  | 17,000 | 17,000
Cash | 6,900 |  | 6,900 | $ 6,900
Credit loss impairment expense | 41,500 |  |  |
Number of vessels operating | Vessel |  |  |  | 2
Affiliate credit loss impairment expense |  |  |  | $ 41,500
Sonatide Marine, Ltd. | Angola, Kwanza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash | 1,200 |  | 1,200 | 1,200
Sonatide Marine, Ltd. | Trade And Others Receivables [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net trade accounts receivable | $ 18,600 |  | $ 18,600 | $ 18,600
DTDW (Neigeria) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of vessels operating | Vessel |  |  |  | 1
Equity method ownership percentage | 40.00% |  | 40.00% | 40.00%
Partners ownership Percentage | 60.00% |  | 60.00% | 60.00%
Secured long-term debt | $ 5,600 |  | $ 5,600 | $ 5,600
Affiliate credit loss impairment expense |  |  |  | 12,100
Guarantor obligations, maximum exposure | $ 2,000 |  | $ 2,000 | 2,000
Sonatide Marine, Ltd. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Dividend declared |  |  |  | 35,000
Written down of investments from joint venture |  |  |  | $ 0
Sonatide Marine, Ltd. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Dividend received by Sonangol company |  | $ 17,900 |  |

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