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Subsequent Events (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Oct. 28, 2014 Subsequent Event [Member] | Oct. 31, 2014 Deutsche Bank AG [Member] Subsequent Event [Member] | Apr. 30, 2014 Line of Credit [Member] Deutsche Bank AG [Member] | Sep. 30, 2014 Line of Credit [Member] Amended DB Facility [Member] Deutsche Bank AG [Member] | Oct. 01, 2014 Line of Credit [Member] Amended DB Facility [Member] Deutsche Bank AG [Member] Subsequent Event [Member] | Oct. 31, 2014 Commercial Mortgage Backed Securities [Member] Subsequent Event [Member]
Stock Transactions, Parenthetical Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend declared per share of common stock | $ 0.40 | $ 0.40 | $ 1.2 | $ 1.2 | $ 0.40 |  |  |  |  |
Maximum borrowing under facility |  |  |  |  |  |  | $ 100,000,000 | $ 275,000,000 | $ 300,000,000 |
Mortgage Loans on Real Estate [Abstract] |  |  |  |  |  |  |  |  |  |
Equity deployed to acquire CMBS |  |  |  |  |  |  |  |  |  | 4,657,000
Aggregate purchase price of CMBS |  |  |  |  |  |  |  |  |  | 23,283,000
Borrowings under term repurchase |  |  |  |  |  | $ 18,626,000 |  |  |  |
Weighted Average Life |  |  |  |  |  |  |  |  |  | 3 years
Internal rate of return |  |  |  |  |  |  |  |  |  | 15.00%

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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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