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Comparison of Total Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014
--- | --- | ---
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | $ 5,002,465 |  | $ 4,885,829 |
Investments in, at equity, and advances to unconsolidated companies | 70,803 |  | 63,928 |
Operating Segments |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,429,835 |  | 4,435,925 |
Operating Segments | Americas |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 1,127,132 |  | 1,017,736 |
Operating Segments | Asia/Pacific |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 471,702 |  | 421,379 |
Operating Segments | Middle East/North Africa |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 620,638 |  | 613,303 |
Operating Segments | Sub-Saharan Africa/Europe |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 2,210,363 |  | 2,383,507 |
Other |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 40,747 |  | 31,545 |
Assets Before Equity Method Investments |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,470,582 |  | 4,467,470 |
Assets Before Corporate Assets |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | 4,541,385 |  | 4,531,398 |
Corporate |  |  |  |
Segment and Geographic Distribution of Operations [Line Items] |  |  |  |
Assets | $ 461,080 | [1] | $ 354,431 | [1]
[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, 2014 and March 31, 2014, $250.0 million and $228.9 million, respectively, of vessel construction costs are included in Corporate.

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