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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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