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Affiliates Balances - Additional Information (Detail) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items] |
Number of vessels operating | Vessel | 220
Sonatide Marine, Ltd. |
Schedule Of Equity Method Investments [Line Items] |
Due from affiliate current net after offsetting due to affiliate | $ 64.7
Cash | $ 52.2
Number of vessels operating | Vessel | 3
Number of vessels stacked | Vessel | 1
Sonatide Marine, Ltd. | Angola, Kwanza |
Schedule Of Equity Method Investments [Line Items] |
Cash | $ 14.4
Sonatide Marine, Ltd. | Trade Accounts Receivable |
Schedule Of Equity Method Investments [Line Items] |
Net trade accounts receivable | $ 18.4

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