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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]    
Additions to properties and equipment $ 128,411 $ 220,309
Sub-Saharan Africa/Europe | Troms Offshore Supply AS
   
Segment Reporting Information [Line Items]    
Additions to properties and equipment   $ 245,600