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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]      
General and administrative expenses $ 153,811 $ 189,819 $ 187,976
Additions to properties and equipment 194,485 364,194 594,695
Corporate Vessels      
Segment Reporting Information [Line Items]      
Construction costs 136,800 235,200 228,900
Sub-Saharan Africa/Europe | Troms Offshore Supply AS      
Segment Reporting Information [Line Items]      
Additions to properties and equipment     245,600
Corporate      
Segment Reporting Information [Line Items]      
General and administrative expenses [1] $ 34,078 $ 40,621 47,703
Corporate | Troms Offshore Supply AS      
Segment Reporting Information [Line Items]      
General and administrative expenses     $ 3,700
[1] Included in Corporate general and administrative expenses for the year ended March 31, 2014 are transaction costs of $3.7 million related to the acquisition of Troms Offshore.