Shareholders Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	0 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2013	Nov. 15, 2013 Common Class A	Jun. 03, 2013 Common Class A	Dec. 31, 2013 Common Class A Vote	Dec. 31, 2012 Common Class A	Dec. 31, 2011 Common Class A Riverside Renewable Energy Investments	Dec. 31, 2013 Common Class A First Issuance	Dec. 31, 2013 Common Class A Second Issuance
Class of Stock [Line Items]
Common stock shares issued for service rendered		5,900,000	3,400,000	18,517	33,056
Issued common stock and received proceeds	$ 27,333	$ 18,400	$ 8,400
Issued warrants to purchase to purchase common stock		5,000,000	1,700,000
Warrants exercise price		3.41	2.60	2.50
Common stock, expiry date							May 15, 2019	Jun. 03, 2018
Class A common stock, entitled vote				1
Ownership percentage of Class A common stock						22.00%