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Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Mar. 31, 2015
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 4,607,665	$ 4,756,162
Investments in, at equity, and advances to unconsolidated companies		59,420	65,844
Equity Method Investments
Segment and Geographic Distribution of Operations [Line Items]
Investments in, at equity, and advances to unconsolidated companies		59,420	65,844
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,203,687	4,253,391
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,167,189	1,016,133
Operating Segments | Asia/Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets		505,317	506,265
Operating Segments | Middle East/North Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets		606,105	666,983
Operating Segments | Sub-Saharan Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,925,076	2,064,010
Other
Segment and Geographic Distribution of Operations [Line Items]
Assets		47,824	49,554
Assets Before Equity Method Investments
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,251,511	4,302,945
Assets Before Corporate Assets
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,310,931	4,368,789
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	$ 296,734	$ 387,373
[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 vessels is assigned to a non-corporate reporting segment or the date it is delivered. At September 30, 2015 and March 31, 2015, $133 million and $235.2 million, respectively, of vessel construction costs are included in Corporate.

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