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Borrowings - Additional Information (Detail) (Line of Credit [Member], USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 3 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 UBS [Member] | Dec. 31, 2013 UBS [Member] | Sep. 30, 2013 UBS [Member] Six Month LIBOR [Member] | Feb. 28, 2013 JP Morgan Chase [Member] | Jan. 31, 2010 JP Morgan Chase [Member] | Dec. 31, 2013 JP Morgan Chase [Member] | Dec. 31, 2012 JP Morgan Chase [Member] | Feb. 28, 2013 JP Morgan Chase [Member] One Month LIBOR [Member] | Apr. 30, 2012 JP Morgan Chase [Member] One Month LIBOR [Member] | Jan. 31, 2010 JP Morgan Chase [Member] One Month LIBOR [Member] | Dec. 31, 2013 JP Morgan Chase [Member] One Month LIBOR [Member] | Feb. 28, 2013 Wells Fargo [Member] | Dec. 31, 2011 Wells Fargo [Member] | Aug. 31, 2010 Wells Fargo [Member] extension | Dec. 31, 2013 Wells Fargo [Member] | Dec. 31, 2012 Wells Fargo [Member] | Jun. 30, 2012 Wells Fargo [Member] Commercial Mortgage Backed Securities [Member] | Aug. 31, 2010 Wells Fargo [Member] Financial Guarantee [Member] | Dec. 22, 2011 Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Wells Fargo [Member] One Month LIBOR [Member] | Aug. 31, 2010 Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Wells Fargo [Member] One Month LIBOR [Member] Commercial Mortgage Backed Securities [Member] | Jun. 30, 2012 Wells Fargo [Member] One Month LIBOR [Member] Commercial Mortgage Backed Securities [Member] | Jan. 31, 2010 Minimum [Member] JP Morgan Chase [Member] | Aug. 31, 2010 Minimum [Member] Wells Fargo [Member] | Jan. 31, 2010 Maximum [Member] JP Morgan Chase [Member] | Aug. 31, 2010 Maximum [Member] Wells Fargo [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility |  |  | $ 133,333,000 | $ 133,899,000 |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  | $ 506,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period | 3 years 3 months 12 days | 1 year 1 month 6 days | 4 years | 4 years 8 months 12 days | [1] |  |  |  | 1 year 1 month 6 days | [1] | 5 days |  |  |  |  |  |  |  | 2 months 12 days | 1 year 1 month 6 days | [1] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Period of Potential Extension |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point |  |  |  |  |  | 1.55% |  |  |  |  |  | 2.50% | 2.50% | 3.00% | 2.50% |  |  |  |  |  |  |  |  | 1.50% | 1.05% | 1.25% | 1.75% | 2.35% |  |  |  |
Line of Credit Facility, Estimated Fair Value of Collateral Pledged Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% | 85.00% | 90.00% | 90.00%
Line of Credit Facility, Margin of Cash Borrowed, Percentage |  |  | 22.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Covenant, Minimum Net Asset Value |  |  | 500,000,000 |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Covenant, Maximum Debt to Tangible Net Worth Ratio |  |  | 3 |  |  |  | 3 |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Threshold Amount for Margin Calls |  |  |  |  |  |  | 0 | 250,000 |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Loan Extension Fee Percentage |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum Liquidity Percentage |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Consolidated Recourse Indebtedness |  |  |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum Net Income |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Number of Extensions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum Net Asset Value Percentage During Prior Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum Net Asset Value Percentage During Prior Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant, Minimum EBITDA to Interest Expense Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Limited Guarantee Percentage Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,500,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Financing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Assumes extension options are exercised.

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- Definition Line of Credit Facility, Loan Extension Fee Percentage + References No definition available. + Details
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