Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Mar. 31, 2015
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 4,480,515	$ 4,756,162
Investments in, at equity, and advances to unconsolidated companies		45,663	65,844
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		45,789	49,554
Assets Before Equity Method Investments
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,157,072	4,302,945
Assets Before Corporate Assets
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,202,735	4,368,789
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,111,283	4,253,391
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,132,305	1,016,133
Operating Segments | Asia/Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets		515,380	506,265
Operating Segments | Middle East/North Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets		591,657	666,983
Operating Segments | Sub-Saharan Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,871,941	2,064,010
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	$ 277,780	$ 387,373

[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 vessels is assigned to a non-corporate reporting segment or the date it is delivered. At December 31, 2015 and March 31, 2015, $150.1 million and $235.2 million, respectively, of vessel construction costs are included in Corporate.