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Summary of Operations in Angola (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Vessel	Sep. 30, 2018 USD ($) Vessel	Sep. 30, 2019 USD ($) Vessel	Sep. 30, 2018 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items]
Revenues of Angolan operations (in thousands) | $	$ 119,765	$ 99,192	$ 367,772	$ 296,286
Number of company owned vessels in Angola			220
ANGOLA
Schedule Of Equity Method Investments [Line Items]
Revenues of Angolan operations (in thousands) | $	$ 11,534	$ 15,154	$ 41,194	$ 43,874
Percent of consolidated vessel revenues	10.00%	16.00%	11.00%	15.00%
Number of company owned vessels in Angola	31	36	33	38
Number of stacked company owned vessels in Angola	14	16	14	16

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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