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Affiliates Balances - Additional Information (Detail) - Sonatide Marine, Ltd. $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items]
Due from affiliate current net after offsetting due to affiliate	$ 67.0
Cash	$ 51.0
Number of vessels operating | Vessel	3
Number of vessels stacked | Vessel	1
Angola, Kwanza
Schedule Of Equity Method Investments [Line Items]
Cash	$ 15.0
Trade Accounts Receivable
Schedule Of Equity Method Investments [Line Items]
Net trade accounts receivable	$ 19.0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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