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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.