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Credit Facilities - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||
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Jul. 31, 2013
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Dec. 31, 2013
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Sep. 30, 2012
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Sep. 30, 2012
Senior Secured Revolving Credit Facility [Member]
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Sep. 30, 2011
Senior Secured Revolving Credit Facility [Member]
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Jul. 31, 2013
Scenario, Forecast [Member]
Senior Secured Revolving Credit Facility [Member]
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Dec. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
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Dec. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Federal Funds [Member]
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Jul. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Scenario, Forecast [Member]
Senior Secured Revolving Credit Facility [Member]
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Dec. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Credit Default Option [Member]
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Dec. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
U.S. Federal Government [Member]
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Dec. 31, 2013
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Institutional [Member]
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Dec. 31, 2013
Qualifying Project Finance Loans (PF Facility) [Member]
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Dec. 31, 2013
Qualifying Project Finance Loans (PF Facility) [Member]
Federal Funds [Member]
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Jul. 31, 2013
Qualifying Project Finance Loans (PF Facility) [Member]
Scenario, Forecast [Member]
Senior Secured Revolving Credit Facility [Member]
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Dec. 31, 2013
Qualifying Project Finance Loans (PF Facility) [Member]
Credit Default Option [Member]
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| Credit Facility [Line Items] | ||||||||||||||||
| Credit facility outstanding | $ 77,114,000 | $ 4,599,000 | $ 350,000,000 | $ 200,000,000 | $ 150,000,000 | |||||||||||
| Maximum advances on credit facilities | 700,000,000 | 400,000,000 | 300,000,000 | |||||||||||||
| Termination of credit facility | 2018-07 | 2018-07 | ||||||||||||||
| Description of credit facility | Continuing Guaranty dated July 19, 2013 | Limited Guaranty dated July 19, 2013 | ||||||||||||||
| London Interbank Offered Rate | LIBOR plus 1.50% | Federal Funds Rate plus 1.50% | LIBOR plus 2.50% | LIBOR plus 2.50% | Federal Funds Rate plus 2.50% | LIBOR plus 5.00% | ||||||||||
| Floating interest rate | 1.50% | 1.50% | 2.50% | 2.50% | 2.50% | 5.00% | ||||||||||
| Applicable valuation percentages | 80.00% | 75.00% | 67.00% | |||||||||||||
| Outstanding borrowings | 77,100,000 | 4,600,000 | ||||||||||||||
| Pledge of investments in financing receivables | 114,300,000 | |||||||||||||||
| Issuance costs | 8,600,000 | |||||||||||||||
| 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% | |||||||||||||||
| Interest paid on credit facilities | $ 300,000 | $ 300,000 | ||||||||||||||