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Subsequent Events - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  |  | 1 Months Ended | 0 Months Ended | 1 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 22, 2011 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Feb. 28, 2013 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Aug. 31, 2010 Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Dec. 31, 2013 Commercial mortgage loans [Member] | Dec. 31, 2012 Commercial mortgage loans [Member] | Dec. 31, 2013 Subordinate Loans [Member] | Dec. 31, 2012 Subordinate Loans [Member] | Oct. 31, 2013 Subordinate Loans [Member] Hotel [Member] | Jun. 30, 2013 Subordinate Loans [Member] Hotel [Member] | Feb. 26, 2014 Subsequent Event [Member] | Feb. 27, 2014 Subsequent Event [Member] Line of Credit [Member] Wells Fargo [Member] One Month LIBOR [Member] | Feb. 27, 2014 Subsequent Event [Member] Commercial mortgage loans [Member] Residential Condominium [Member] Luxury Residential Condominium - Montgomery County, MD [Member] unit | Jan. 31, 2014 Subsequent Event [Member] Subordinate Loans [Member] Hotel [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point |  |  |  |  |  |  |  |  | 1.50% | 1.05% | 1.25% |  |  |  |  |  |  |  | 0.80% |  |
Original Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 164,000,000 | $ 154,844,000 | $ 495,319,000 | $ 245,875,000 |  |  |  |  | $ 80,000,000 |
Mortgage Loans on Real Estate, Funded Amount of Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |
Number of Units in Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
Rate of Commercial Mortgage loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 months |
Debt Instrument Extension Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |
Debt Instrument, Underwritten Loan to Net Sellout, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68.00% |
Mortgage Loans on Real Estate, Internal Rate of Return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% | 19.00% |  |  | 15.00% | 14.00%
Dividend declared per share of common stock | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 |  |  |  |  |  |  |  |  |  | $ 0.40 |  |  |
Proceeds from Collection of Loans Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 | $ 15,000,000 |  |  |  | $ 15,000,000

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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