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Credit Facility - Additional Information (Detail) (USD $)
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9 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | ||||||||||
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Sep. 30, 2014
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Dec. 31, 2013
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Dec. 31, 2013
Senior Secured Revolving Credit Facility [Member]
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Sep. 30, 2014
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]
Senior Secured Revolving Credit Facility [Member]
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Sep. 30, 2014
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Credit Default Option [Member]
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Sep. 30, 2014
Qualifying Government and Institutional Loans (G&I Facility) [Member]
U.S. Federal Government [Member]
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Sep. 30, 2014
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Institutional [Member]
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Sep. 30, 2014
Qualifying Government and Institutional Loans (G&I Facility) [Member]
Federal Funds [Member]
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Sep. 30, 2014
Qualifying Project Finance Loans (PF Facility) [Member]
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May 31, 2014
Qualifying Project Finance Loans (PF Facility) [Member]
Minimum [Member]
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May 31, 2014
Qualifying Project Finance Loans (PF Facility) [Member]
Maximum [Member]
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Dec. 31, 2013
Qualifying Project Finance Loans (PF Facility) [Member]
Senior Secured Revolving Credit Facility [Member]
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Sep. 30, 2014
Qualifying Project Finance Loans (PF Facility) [Member]
Credit Default Option [Member]
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Sep. 30, 2014
Qualifying Project Finance Loans (PF Facility) [Member]
Federal Funds [Member]
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| Line of Credit Facility [Line Items] | |||||||||||||||
| Credit facility outstanding | $ 212,764,000 | $ 77,114,000 | $ 350,000,000 | $ 200,000,000 | $ 250,000,000 | ||||||||||
| Maximum advances on credit facilities | 900,000,000 | 400,000,000 | 500,000,000 | ||||||||||||
| Line of credit facility, increase in overall capacity | 200,000,000 | 500,000,000 | |||||||||||||
| Line of credit facility, increase in maximum borrowing capacity | 100,000,000 | 250,000,000 | |||||||||||||
| Termination of credit facility | Jul. 19, 2018 | Jul. 19, 2018 | |||||||||||||
| Description of credit facility | Continuing Guaranty, dated July 19, 2013 | Limited Guaranty, dated July 19, 2013 | |||||||||||||
| London Interbank Offered Rate | LIBOR plus 1.50% | LIBOR plus 2.50% | Federal Funds Rate plus 1.50% | LIBOR plus 2.50% | LIBOR plus 5.00% | Federal Funds Rate plus 2.50% | |||||||||
| Floating interest rate | 4.25% | 1.50% | 2.50% | 1.50% | 2.50% | 5.00% | 2.50% | ||||||||
| Applicable valuation percentages | 80.00% | 75.00% | 67.00% | ||||||||||||
| Outstanding borrowings | 212,800,000 | 77,100,000 | |||||||||||||
| Pledge of investments in financing receivables | 251,900,000 | 114,300,000 | |||||||||||||
| Issuance costs | $ 10,700,000 | ||||||||||||||
| Weighted average short-term borrowing rate | 2.40% | 2.60% | |||||||||||||
| 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% | ||||||||||||||