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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 19,004 | $ 12,455 | $ 42,727 | $ 24,151
Operating loss | (6,841) | (26,400) | (15,098) | (39,067)
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating loss | (737) | (5,230) | (2,613) | (8,010)
Wind |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 13,583 | 7,462 | 31,747 | 15,113
Wind | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating loss | (1,991) | (14,611) | (1,864) | (18,091)
Grid |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,421 | 4,993 | 10,980 | 9,038
Grid | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating loss | $ (4,113) | $ (6,559) | $ (10,621) | $ (12,966)

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