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Affiliates Balances - Additional Information (Detail) - Sonatide Marine, Ltd. $ in Millions | Mar. 31, 2020 USD ($) Vessel
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Schedule of Equity Method Investments [Line Items] |
Due from affiliate current net after offsetting due to affiliate | $ 64.2
Cash | $ 45.6
Number of vessels operating | Vessel | 2
Angola, Kwanza |
Schedule of Equity Method Investments [Line Items] |
Cash | $ 3.2
Trade Accounts Receivable |
Schedule of Equity Method Investments [Line Items] |
Net trade accounts receivable | $ 18.9

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