Quarterly report pursuant to Section 13 or 15(d)

The Company - Additional Information (Detail)

v2.4.0.8
The Company - Additional Information (Detail) (USD $)
0 Months Ended 6 Months Ended
May 28, 2014
acre
Apr. 23, 2013
Jun. 30, 2014
Apr. 29, 2014
May 23, 2013
Apr. 23, 2013
Organization [Line Items]            
Initial public offering, shares           14,200,000
Net proceeds from offering   $ 160,000,000        
Underwriters shares of common stock         800,000  
Share issued pursuant to underwriter       750,000    
First follow-on public offering, shares       5,750,000    
First follow-on public offering, price per share       $ 13.00    
Net proceeds from first follow-on from public offering       70,400,000    
Acquisition date     May 28, 2014      
Business combination consideration paid 106,900,000          
Area of land acquired 7,500          
Acquisition related costs 1,100,000          
Business combination cash consideration $ 600,000   $ 106,744,000      
Cash consideration amortization period 3 years          
Solar [Member]
           
Organization [Line Items]            
Number of solar projects 3          
Wind [Member]
           
Organization [Line Items]            
Number of solar projects 57