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Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2017	Mar. 31, 2017
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 1,812,852
Assets excluding equity investments		1,311,534
Investments in, at equity, and advances to unconsolidated companies		25,729
Assets except corporate portion		1,337,263
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		19,026
Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Assets			$ 4,190,699
Assets excluding equity investments			3,282,098
Investments in, at equity, and advances to unconsolidated companies			45,115
Assets except corporate portion			3,327,213
Predecessor | All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets			21,580
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,292,508
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets		189,908
Operating Segments | Middle East/Asia Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets		67,491
Operating Segments | Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,035,109
Operating Segments | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Assets			3,260,518
Operating Segments | Predecessor | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets			779,778
Operating Segments | Predecessor | Middle East/Asia Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets			583,385
Operating Segments | Predecessor | Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets			1,897,355
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	$ 475,589
Corporate | Predecessor
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]		$ 863,486
[1] 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 September 30, 2017 and March 31, 2017, $7.0 million and $52.4 million, respectively, of vessel construction costs are included in Corporate

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+ References

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
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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

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