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Comparison of Total Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | $ 1,792,270 | $ 1,827,739
Investments in, at equity, and advances to unconsolidated companies | 658 | 1,039
All Other Segments |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 4,960 | 7,440
Operating Segments | Americas |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 375,087 | 380,168
Operating Segments | Middle East/Asia Pacific |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 238,283 | 233,611
Operating Segments | Europe/Mediterranean Sea |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 415,409 | 316,524
Operating Segments | West Africa |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | 400,876 | 483,234
Corporate |  |
Segment and Geographic Distribution of Operations [Line Items] |  |
Assets | $ 356,997 | $ 405,723

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