XML 51 R58.htm IDEA: XBRL DOCUMENT v2.4.0.8
Business Segments - Operating Results for Two Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Revenues $ 24,181 $ 20,867 $ 47,267 $ 49,583
Operating (loss) income (11,028) (14,970) (19,877) (21,098)
Operating Segments | Wind
        
Segment Reporting Information [Line Items]        
Revenues 14,691 12,002 29,392 28,513
Operating (loss) income (2,449) (6,449) (4,274) (5,148)
Operating Segments | Grid
        
Segment Reporting Information [Line Items]        
Revenues 9,490 8,865 17,875 21,070
Operating (loss) income (5,750) (6,572) (10,618) (11,915)
Unallocated Corporate Expenses
        
Segment Reporting Information [Line Items]        
Operating (loss) income $ (2,829) $ (1,949) $ (4,985) $ (4,035)