Comparison of Total Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016
Segment and Geographic Distribution of Operations [Line Items]
Assets		$ 4,877,858	$ 4,983,793
Investments in, at equity, and advances to unconsolidated companies		36,989	37,502
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		41,817	42,191
Assets Before Corporate Assets
Segment and Geographic Distribution of Operations [Line Items]
Assets		3,979,497	4,063,801
Assets Before Equity Method Investments
Segment and Geographic Distribution of Operations [Line Items]
Assets		4,016,486	4,101,303
Operating Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets		3,937,680	4,021,610
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,111,872	1,101,699
Operating Segments | Asia/Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets		463,980	514,948
Operating Segments | Middle East
Segment and Geographic Distribution of Operations [Line Items]
Assets		451,178	405,420
Operating Segments | Africa/Europe
Segment and Geographic Distribution of Operations [Line Items]
Assets		1,910,650	1,999,543
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	[1]	$ 861,372	$ 882,490

[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 June 30, 2016 and March 31, 2016, $123.7 million and $136.8 million, respectively, of vessel construction costs are included in Corporate