Business Segments - Schedule of Revenues by Major Customers (Detail) - Total Revenue - Customer Concentration Risk	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
INOX Wind Limited
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	27.00%	47.00%
Reed & Reed Inc.
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	17.00%	0.00%
Essential Energy
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	13.00%	0.00%
XJ Group Corporation
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	12.00%	0.00%
Beijing JINGCHENG New Energy Co., Ltd
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	0.00%	25.00%
M.A. Mortenson Company
Segment Reporting Asset Reconciling Item [Line Items]
Concentration risk, revenue	0.00%	11.00%