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Affiliates Balances - Additional Information (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) Vessel | Mar. 31, 2018 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items] |  |
Total revenues | $ 122,149 | $ 91,493
Sonatide Marine, Ltd. |  |
Schedule Of Equity Method Investments [Line Items] |  |
Due from affiliate current net after offsetting due to affiliate | 63,000 |
Cash | $ 50,000 |
Number of vessels operating | Vessel | 3 |
Number of vessels stacked | Vessel | 1 |
Sonatide Marine, Ltd. | ANGOLA |  |
Schedule Of Equity Method Investments [Line Items] |  |
Number of vessels operating | Vessel | 35 | 40
Number of vessels stacked | Vessel | 14 | 18
Total revenues | $ 15,000 | $ 14,000
Percentage of Angolan operation revenue | 13.00% | 16.00%
Sonatide Marine, Ltd. | Angola, Kwanza |  |
Schedule Of Equity Method Investments [Line Items] |  |
Cash | $ 20,000 |
Sonatide Marine, Ltd. | Trade Accounts Receivable |  |
Schedule Of Equity Method Investments [Line Items] |  |
Net trade accounts receivable | $ 14,000 |

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