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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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