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Comparison of Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	$ 197,059	$ 230,315
Cash including restricted cash	5,213	21,300
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Cash including restricted cash	353,200	336,400
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	11,200	9,300
Americas
Segment and Geographic Distribution of Operations [Line Items]
Cash held by non-corporate subsidiaries	94,600	95,100
West Africa
Segment and Geographic Distribution of Operations [Line Items]
Due from related parties	$ 197,100	$ 263,700

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