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Credit Facilities - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | ||
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Jul. 31, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Credit Facilities [Line Items] | |||||
| Outstanding borrowings | $ 83,800,000 | $ 4,200,000 | |||
| Pledge of investments in financing receivables | 81,600,000 | ||||
| Investments as collateral for credit facility | 37,500,000 | ||||
| Credit facility outstanding | 83,837,000 | 4,170,000 | |||
| Issuance costs | 8,400,000 | ||||
| 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 | 14,000 | 15,000 | 44,000 | ||
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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% | ||||
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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% | ||||
| 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% | ||||
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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% | ||||
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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% | ||||
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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% | ||||
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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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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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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 | ||||
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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% | ||||