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Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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.

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