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Business Segments - Operating Results for Two Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Revenues $ 12,455 $ 24,181 $ 24,151 $ 47,267
Operating loss (26,400) (11,028) (39,067) (19,877)
Operating Segments | Wind
        
Segment Reporting Information [Line Items]        
Revenues 7,462 14,691 15,113 29,392
Operating loss (14,611) (2,449) (18,091) (4,274)
Operating Segments | Grid
        
Segment Reporting Information [Line Items]        
Revenues 4,993 9,490 9,038 17,875
Operating loss (6,559) (5,750) (12,966) (10,618)
Unallocated corporate expenses
        
Segment Reporting Information [Line Items]        
Operating loss $ (5,230) $ (2,829) $ (8,010) $ (4,985)