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Comparison of Total Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | $ 1,643,542 | $ 1,746,180
Assets excluding equity investments |  | 1,179,617 | 1,251,125
Investments in, at equity, and advances to unconsolidated companies |  | 1,335 | 29,216
Assets except corporate portion |  | 1,180,953 | 1,280,341
All Other Segments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 363 | 2,443
Operating Segments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1] | 1,179,254 | 1,248,682
Operating Segments | Americas |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1],[2] | 310,121 | 164,958
Operating Segments | Middle East/Asia Pacific |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1] | 215,105 | 48,268
Operating Segments | Europe/Mediterranean Sea |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1] | 167,695 | 171,157
Operating Segments | West Africa |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [3] | 486,333 | 864,299
Corporate |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [4] | $ 462,589 | $ 465,839
[1] | The company’s segment level assets as of June 30, 2018, reflect the elimination of certain intersegment balances.
[2] | Americas segment assets include cash held by non-corporate subsidiaries of $94.6 million and 95.1 million, as of June 30, 2018 and December 31, 2017, respectively.
[3] | West Africa segment assets include due from related parties of $197.1 million and $263.7 million as of June 30, 2018 and December 31, 2017, respectively.
[4] | Corporate includes cash (including restricted cash) of $353.2 million and $336.4 million as of June 30, 2018 and December 31. 2017, respectively. Also included in Corporate is a vessel under construction which has 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 June 30, 2018 and December 31, 2017, $11.2 million and $9.3 million, respectively, of vessel construction costs are included in Corporate.

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