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Comparison of Total Assets (Detail) - Entity [Domain] - USD ($) $ in Thousands | Jun. 30, 2015 | Mar. 31, 2015
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | $ 4,713,484 | $ 4,756,162
Investments in, at equity, and advances to unconsolidated companies |  | 62,701 | 65,844
Operating Segments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 4,247,092 | 4,253,391
Operating Segments | Americas |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 1,087,484 | 1,016,133
Operating Segments | Asia/Pacific |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 497,040 | 506,265
Operating Segments | Middle East/North Africa |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 621,676 | 666,983
Operating Segments | Sub-Saharan Africa/Europe |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 2,040,892 | 2,064,010
Other |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 47,082 | 49,554
Assets Before Equity Method Investments |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 4,294,174 | 4,302,945
Assets Before Corporate Assets |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets |  | 4,356,875 | 4,368,789
Corporate |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |
Assets | [1] | $ 356,609 | $ 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 June 30, 2015 and March 31, 2015, $181.5 million and $235.2 million, respectively, of vessel construction costs are included in Corporate.

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