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Commercial Mortgage Loans - Additional Information (Detail) (USD $)		12 Months Ended					1 Months Ended		12 Months Ended
	Jan. 31, 2010 Master Repurchase Facility [Member] JP Morgan Chase [Member]	Dec. 31, 2013 Commercial mortgage loans [Member]	Dec. 31, 2012 Commercial mortgage loans [Member]	Dec. 31, 2013 Commercial mortgage loans [Member] Hotel [Member] Hotel - Silver Spring, MD [Member] room	Dec. 31, 2012 Commercial mortgage loans [Member] Hotel [Member] Hotel - Silver Spring, MD [Member] room	Mar. 31, 2013 Commercial mortgage loans [Member] Hotel [Member] Hotel - Silver Spring, MD [Member]	Apr. 30, 2012 Commercial mortgage loans [Member] Hotel [Member] Hotel - Manhattan, NY [Member] Master Repurchase Facility [Member] JP Morgan Chase [Member] room	Sep. 30, 2013 Commercial mortgage loans [Member] Mixed Use [Member] Mixed Use - South Boston, MA [Member] participation_interest acre	Dec. 31, 2012 Commercial mortgage loans [Member] Mixed Use [Member] Mixed Use - South Boston, MA [Member] acre
Mortgage Loans on Real Estate [Line Items]
Fees Received On Loan Transfer						$ 280,000
Senior Sub-Participation Interests								2
Property Size, Area								20	20
Mortgage Loans on Real Estate, Sub-Participation Percentage of Par								78.00%
Mortgage Loans on Real Estate, Sub-Participation Brokerage Fee								3.00%
Mortgage Loans on Real Estate, Internal Rate of Return								25.00%
Repayment of mortgage loan		164,000,000	154,844,000	26,000,000	26,000,000		24,000,000		23,844,000
Rate of Commercial Mortgage loan							2 years
Property Size, Number of Units				263	263		155
Coupon rate of loan		8.82%	7.82%	9.00%			8.00%
Repayment of JP Morgan Facility							15,444,000
Company's master repurchase facility	$ 100,000,000						$ 100,000,000

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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