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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.