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Affiliates Balances - Additional Information (Detail) - Sonatide Marine, Ltd. $ in Millions	Mar. 31, 2020 USD ($) Vessel
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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