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Credit Facilities - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | |||
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Jul. 31, 2013
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Credit Facilities [Line Items] | ||||||
| Credit facility outstanding | $ 4,169,818 | |||||
| Issuance costs | 8,100,000 | |||||
| Line of credit facility amortization period | 60 month | |||||
| Fees for loan agreement description | Fees for each Loan Agreement equal to 0.50%, divided by 360, multiplied by the excess of the available borrowing capacity under each Loan Agreement over the actual amount borrowed under such Loan Agreement. | |||||
| Default underlying financings | 50.00% | |||||
| (Loss) gain on derivative instruments | (4,177) | 15,170 | 14,808 | 29,965 | ||
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Qualifying government and institutional loans (G&I Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| Termination of credit facility | 2018-07 | |||||
| Description of credit facility | Continuing Guaranty dated July 19, 2013 | |||||
| London Interbank Offered Rate | LIBOR plus 1.50% | |||||
| Floating interest rate | 1.50% | 1.50% | ||||
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Qualifying project finance loans (PF Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| Termination of credit facility | 2018-07 | |||||
| Description of credit facility | Limited Guaranty dated July 19, 2013 | |||||
| London Interbank Offered Rate | LIBOR plus 2.50% | |||||
| Floating interest rate | 2.50% | 2.50% | ||||
| Applicable valuation percentages | 67.00% | |||||
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Credit Default Option [Member] | Qualifying government and institutional loans (G&I Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| London Interbank Offered Rate | LIBOR plus 2.50% | |||||
| Floating interest rate | 2.50% | 2.50% | ||||
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Credit Default Option [Member] | Qualifying project finance loans (PF Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| London Interbank Offered Rate | LIBOR plus 5.00% | |||||
| Floating interest rate | 5.00% | 5.00% | ||||
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Federal Funds [Member] | Qualifying government and institutional loans (G&I Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| London Interbank Offered Rate | Federal Funds Rate plus 1.50% | |||||
| Floating interest rate | 1.50% | 1.50% | ||||
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Federal Funds [Member] | Qualifying project finance loans (PF Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| London Interbank Offered Rate | Federal Funds Rate plus 2.50% | |||||
| Floating interest rate | 2.50% | 2.50% | ||||
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U.S. Federal Government [Member] | Qualifying government and institutional loans (G&I Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| Applicable valuation percentages | 80.00% | |||||
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Institutional [Member] | Qualifying government and institutional loans (G&I Facility) [Member]
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| Credit Facilities [Line Items] | ||||||
| Applicable valuation percentages | 75.00% | |||||
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Subsequent Event [Member] | Senior secured revolving credit facility [Member]
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| Credit Facilities [Line Items] | ||||||
| Credit facility outstanding | 350,000,000 | |||||
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Subsequent Event [Member] | Scenario, Forecast [Member] | Senior secured revolving credit facility [Member]
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| Credit Facilities [Line Items] | ||||||
| Credit facility outstanding | 350,000,000 | |||||
| Maximum advances on credit facility | 700,000,000 | |||||
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Subsequent Event [Member] | Scenario, Forecast [Member] | Qualifying government and institutional loans (G&I Facility) [Member] | Senior secured revolving credit facility [Member]
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| Credit Facilities [Line Items] | ||||||
| Credit facility outstanding | 200,000,000 | |||||
| Maximum advances on credit facility | 400,000,000 | |||||
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Subsequent Event [Member] | Scenario, Forecast [Member] | Qualifying project finance loans (PF Facility) [Member] | Senior secured revolving credit facility [Member]
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| Credit Facilities [Line Items] | ||||||
| Credit facility outstanding | 150,000,000 | |||||
| Maximum advances on credit facility | $ 300,000,000 | |||||