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Subsequent Events - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Feb. 28, 2013 Subsequent Event [Member] | Jan. 31, 2013 Subsequent Event [Member] Tower sqft | Feb. 28, 2013 Subsequent Event [Member] Credit Facility [Member] | Feb. 28, 2013 Subsequent Event [Member] First Year [Member] Credit Facility [Member] | Feb. 28, 2013 Subsequent Event [Member] Second Year [Member] Credit Facility [Member] | Feb. 28, 2013 Subsequent Event [Member] Wells Facility borrowings [Member] | Feb. 28, 2013 JPMorgan Facility borrowings [Member] Subsequent Event [Member] | Feb. 28, 2013 AAA-Rated CMBS [Member] Subsequent Event [Member] Wells Facility borrowings [Member] | Feb. 28, 2013 CMBS - Hilton (Fair Value Option) [Member] Subsequent Event [Member] Wells Facility borrowings [Member] | Feb. 28, 2013 Minnesota [Member] Subsequent Event [Member] Hotel Patient | Feb. 28, 2013 Repayments Of Mezzanine Loans [Member] Subsequent Event [Member] | Jan. 31, 2013 Mezzanine Loan [Member] Subsequent Event [Member] | Jan. 31, 2013 CDO Bonds [Member] Subsequent Event [Member] | Feb. 28, 2013 Midtown Manhattan [Member] Subsequent Event [Member] sqft | Feb. 28, 2013 Three Mortgage [Member] Subsequent Event [Member] | Feb. 28, 2013 Minimum [Member] AAA-Rated CMBS [Member] Subsequent Event [Member] Wells Facility borrowings [Member] | Feb. 28, 2013 Maximum [Member] AAA-Rated CMBS [Member] Subsequent Event [Member] Wells Facility borrowings [Member] | Feb. 28, 2013 Five Year Mortgage [Member] Minnesota [Member] Subsequent Event [Member] | Feb. 28, 2013 First Mortgage [Member] Minnesota [Member] Subsequent Event [Member] | Feb. 28, 2013 First Mortgage [Member] Midtown Manhattan [Member] Subsequent Event [Member] | Dec. 31, 2012 Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine loan |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  | $ 25,000,000 | $ 50,000,000 |  |  | $ 18,000,000 | $ 90,000,000 |  |  | $ 145,000,000 | $ 120,000,000 | $ 72,000,000 |
Net saleable square foot |  |  |  |  |  |  |  |  |  |  | 352,624 |  |  |  |  |  |  |  |  |  |  |  | 181,637 |  |  |  |  |  |  |
Story buildings |  |  |  |  |  |  |  |  |  |  | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condominium tower |  |  |  |  |  |  |  |  |  |  | 146 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Funded |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Financing to be Funded |  |  |  |  |  |  |  |  |  |  | 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 13.25% |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |
Origination fee | 1.00% |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit fee |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan-to-net sellout |  |  |  |  |  |  |  |  |  |  | 54.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine loan term |  |  |  |  |  |  |  |  |  |  | 12-months |  |  |  |  |  |  |  |  |  | 54 months |  |  | The mezzanine loan is part of a $90,000, three-year (two-year initial term with one one-year extension option) |  |  |  |  |  |
Internal rate of return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  | 17.00% |  |  |  |  |  |  |  |
Multifamily rental units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 215 |  |  |  |  |  |  |
Interest rate on the mezzanine loan, minimum |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  | 1.05% | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on the mezzanine loan, maximum |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  | 2.35% |  |  |  |  |  |  | 1.25% | 1.50% |  |  |  |
Transaction fee |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appraised loan-to-value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69.00% |  |  |  | 60.00% |  |  |  |  |  |  |
Equity interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Number of patients treated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share of common stock | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 27, 2013
Payment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 29, 2013
Record date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 28, 2013
Libor rate |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan extension fees |  |  |  |  |  |  |  |  | 0.50% |  |  |  | 0.50% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Yield Maintenance Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extended maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | March 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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