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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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