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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 1 Months Ended | 0 Months Ended
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Jan. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Nov. 06, 2013 Subsequent Event [Member] Condo Conversion – NY, NY | Nov. 04, 2013 Subsequent Event [Member] AAA-rated CMBS [Member] | Oct. 31, 2013 Subsequent Event [Member] AAA-rated CMBS [Member] | Oct. 31, 2013 Subsequent Event [Member] Mezzanine loans [Member] nursing_facility | Nov. 04, 2013 Subsequent Event [Member] Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  | Nov. 04, 2013
Dividend declared per share of common stock |  | $ (0.40) | $ (0.40) | $ (1.20) | $ (1.20) |  |  |  |  |  | $ 0.40
Payment Date |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2014
Record Date |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2013
Participating Mortgage Loans, Participation Liabilities, Amount |  |  |  |  |  |  |  |  |  | $ 47,000 |
Number of Nursing Facilities |  |  |  |  |  |  |  |  |  | 193 |
Participating Mortgage Loans, Mortgage Obligations, Amount |  |  |  |  |  |  |  |  |  | 92,000 |
Loans and Leases Receivable, Loan To Value |  |  |  |  |  |  |  |  |  | 58.00% |
IRR on loan investment | 17.00% |  |  |  |  |  |  |  |  | 12.00% |
Fully Funded Loan Commitments |  |  |  |  |  |  | 34,650 |  |  |  |
Stock Issued During Period, Value, To Acquire Securities |  |  |  |  |  |  |  |  | 4,049 |  |
Mortgage Backed Securities Face Amount |  |  |  |  |  |  |  | 17,994 |  |  |
Weighted Average Life |  |  |  | 2 years 2 months 12 days |  | 1 year 9 months 18 days |  | 3 years 7 months 6 days |  |  |
Borrowings To Finance Mortgage Backed Securities |  |  |  |  |  |  |  | 17,994 |  |  |
Cash Pledged as Collateral |  |  |  |  |  |  |  | 4,049 |  |  |
Proceeds from Collection of Loans Receivable |  |  |  |  |  |  |  |  |  | $ 25,000 |

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- Definition Cash Pledged as Collateral + References No definition available. + Details
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- Definition Fully Funded Loan Commitments + References No definition available. + Details
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- Definition Number of Nursing Facilities + References No definition available. + Details
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- Definition Stock Issued During Period, Value, To Acquire Securities + References No definition available. + Details
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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=6959260&loc=d3e187085-122770 + Details
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- Definition The aggregate amount of the participating mortgage obligation at the end of the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 97-1 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6401569&loc=d3e10013-112621 + Details
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