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Comparison of Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	$ 230,315	$ 174,349
Cash including restricted cash	21,300	7,466
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Cash including restricted cash	336,400	350,200
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	9,300
Americas
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	95,100	100,300
West Africa
Segment and Geographic Distribution of Operations [Line Items]
Due from related parties	$ 263,700	$ 174,300

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