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Business Segments - Schedule of Revenues by Major Customers (Detail) (Sales [Member]) | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Beijing JINGCHENG New Energy Co., Ltd. [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Revenue percentage | 35.00% | 19.00%
INOX Wind Limited. [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Revenue percentage | 15.00% | 15.00%
Karara Mining Ltd. [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Revenue percentage |  | 15.00%
Karara Mining Ltd. [Member] | Maximum [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Revenue percentage | 1.00% |

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