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Comparison of Total Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | $ 1,686,048 | $ 1,746,180
Assets excluding equity investments |  | 1,224,174 | 1,251,125
Investments in, at equity, and advances to unconsolidated companies |  | 13,503 | 29,216
Assets except corporate portion |  | 1,237,677 | 1,280,341
All Other Segments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 465 | 2,443
Operating Segments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 1,223,709 | 1,248,682
Operating Segments | Americas |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 172,536 | 164,958
Operating Segments | Middle East/Asia Pacific |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 21,977 | 48,268
Operating Segments | Europe/Mediterranean Sea |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 170,420 | 171,157
Operating Segments | West Africa |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 858,776 | 864,299
Corporate |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1] | $ 448,371 | $ 465,839
[1] | (A)Included in Corporate are vessels currently under construction which have not yet been assigned to a non-corporate reporting segment. A vessel’s construction costs are reported in Corporate until the earlier of the date the vessel is assigned to a non-corporate reporting segment or the date it is delivered. At March 31, 2018 and December 31, 2017, $9.5 million and $9.3 million, respectively, of vessel construction costs are included in Corporate

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