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Business Segments - Total Business Segments Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets $ 172,525 $ 216,754
Operating Segments | Wind
    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets 50,304 67,111
Operating Segments | Grid
    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets 63,244 72,800
Unallocated Corporate Expenses
    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets $ 58,977 $ 76,843