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Subsequent Events - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  | 0 Months Ended
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Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jul. 31, 2013 Subsequent Event [Member] | Jul. 31, 2013 Subsequent Event [Member] Common Stock [Member] | Jul. 31, 2013 Subsequent Event [Member] Fixed Rate Loan [Member] | Aug. 05, 2013 Subsequent Event [Member] Floating Rate Loan [Member] | Jul. 31, 2013 Subsequent Event [Member] New York [Member] hotel | Aug. 05, 2013 Subsequent Event [Member] Mezzanine Loan [Member] story key parking_space | Jul. 31, 2013 Subsequent Event [Member] Mezzanine Loan [Member] sqft | Jul. 31, 2013 Subsequent Event [Member] Mezzanine Loan [Member] Fixed Rate Loan [Member] | Aug. 05, 2013 Subsequent Event [Member] First Mortgage [Member] Mortgage Loan Issued by Third Party [Member] | Jul. 31, 2013 Subsequent Event [Member] First Mortgage [Member] Mortgage Loan Issued by Third Party [Member] | Jul. 31, 2013 Subsequent Event [Member] Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2013
Dividend declared per share of common stock |  | $ 0.40 | $ 0.40 | $ 0.80 | $ 0.80 |  |  |  |  |  |  |  |  |  |  | $ 0.40
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 11, 2013
Record Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2013
Secured loan receivable, face amount |  |  |  |  |  |  |  | $ 105,000,000 | $ 105,000,000 |  | $ 22,500,000 | $ 25,000,000 | $ 14,000,000 | $ 82,500,000 | $ 91,000,000 |
Number of hotels |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Loan receivable, extended term |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Secured loan receivable |  |  |  |  |  |  |  |  |  |  |  | 13,551,000 |  |  |  |
Loan carrying value as a percentage of face value (percent) |  |  |  |  |  |  |  |  |  |  |  | 97.00% |  |  |  |
Area of building (in square feet) |  |  |  |  |  |  |  |  |  |  |  | 432,717 |  |  |  |
Loan maturity term |  |  |  |  |  | 10 years |  |  | 5 years |  |  |  |  |  |  |
Loan-to-value percentage |  |  |  |  |  |  |  |  |  |  | 73.00% | 70.00% |  |  |  |
IRR on loan investment | 17.00% |  |  |  |  |  |  |  |  |  | 12.00% | 13.00% |  |  |  |
Number of stories in multi-tenant office building |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |
Number of hotel rooms |  |  |  |  |  |  |  |  |  |  | 616 |  |  |  |  |
Number of spaces in parking garage |  |  |  |  |  |  |  |  |  |  | 479 |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |

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