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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 12,455 | $ 24,181 | $ 24,151 | $ 47,267
Operating loss | (26,400) | (11,028) | (39,067) | (19,877)
Operating Segments | Wind |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 7,462 | 14,691 | 15,113 | 29,392
Operating loss | (14,611) | (2,449) | (18,091) | (4,274)
Operating Segments | Grid |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 4,993 | 9,490 | 9,038 | 17,875
Operating loss | (6,559) | (5,750) | (12,966) | (10,618)
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating loss | $ (5,230) | $ (2,829) | $ (8,010) | $ (4,985)

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