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Business Segments - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |
Revenues | $ 23,086 | $ 28,716
Operating (loss) income | (8,850) | (6,128)
Operating Segments [Member] | Wind [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 14,701 | 16,511
Operating (loss) income | (1,825) | 1,301
Operating Segments [Member] | Grid [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 8,385 | 12,205
Operating (loss) income | (4,869) | (5,343)
Unallocated Corporate Expenses [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) income | $ (2,156) | $ (2,086)

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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