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Business Segments - Schedule of Revenues by Major Customers (Detail) (Sales)
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Inox Wind Limited
       
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage 48.00% 27.00% 48.00% 21.00%
RES American Construction, Inc
       
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage 16.00%      
Beijing Jingcheng New Energy Company Limited
       
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage   28.00%   31.00%
Maximum | RES American Construction, Inc
       
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage     10.00%  
Maximum | Beijing Jingcheng New Energy Company Limited
       
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage     10.00%