Quarterly report pursuant to Section 13 or 15(d)

Investment in Financing Receivables and Other Investments - Additional Information (Detail)

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Investment in Financing Receivables and Other Investments - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2013
May 09, 2013
HA EnergySource [Member]
Jun. 30, 2013
HA EnergySource [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]      
Notes receivable - related party   $ 24,000,000 $ 24,300,000
Coupon rate of related party loan   15.22%  
Maturity period of related party loan   May 31, 2018  
Interest paid on the loan     222,247
Deferred funding obligation $ 28,077,827    
Debt security maturity date Dec. 31, 2035