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Business Segments - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 24,181 | $ 20,867 | $ 47,267 | $ 49,583
Operating (loss) income | (11,028) | (14,970) | (19,877) | (21,098)
Operating Segments | Wind |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 14,691 | 12,002 | 29,392 | 28,513
Operating (loss) income | (2,449) | (6,449) | (4,274) | (5,148)
Operating Segments | Grid |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 9,490 | 8,865 | 17,875 | 21,070
Operating (loss) income | (5,750) | (6,572) | (10,618) | (11,915)
Unallocated Corporate Expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating (loss) income | $ (2,829) | $ (1,949) | $ (4,985) | $ (4,035)

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