Property, Plant and Equipment - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Plant
GREECE
Property, Plant and Equipment [Line Items]
Number of Completed Photovoltaic Plants	8
CHINA
Property, Plant and Equipment [Line Items]
Number of Completed Photovoltaic Plants	1
ITALY
Property, Plant and Equipment [Line Items]
Number of Completed Photovoltaic Plants	4