Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	Mar. 31, 2016
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 4,688,262	$ 4,983,793
Assets excluding equity investments		3,781,179	4,063,801
Investments in, at equity, and advances to unconsolidated companies		38,200	37,502
Assets except corporate portion		3,819,379	4,101,303
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		24,673	42,191
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		3,756,506	4,021,610
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,060,391	1,101,699
Operating Segments | Asia/Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets		461,858	514,948
Operating Segments | Middle East
Segment and Geographic Distribution of Operations [Line Items]
Assets		436,583	405,420
Operating Segments | Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,797,674	1,999,543
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1],[2]	$ 868,883	$ 882,490

[1] At September 30, 2016 and March 31, 2016, $641.8 million and $651.2 million, respectively, of cash are included in Corporate.

[2] 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, 2016 and March 31, 2016, $115.7 million and $136.8 million, respectively, of vessel construction costs are included in Corporate.