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Stockholders' Equity - Dividends Declared (Detail) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Dividends Payable [Line Items] | ||||
| Common Stock, distributions declared per share | $ 0.375 | $ 0.375 | $ 1.125 | $ 1.125 |
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Common Stock [Member]
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| Dividends Payable [Line Items] | ||||
| Common Stock, distributions declared per share | $ 0.375 | $ 0.375 | $ 1.125 | $ 1.125 |
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Senior Common Stock [Member]
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| Dividends Payable [Line Items] | ||||
| Common Stock, distributions declared per share | $ 0.2625 | $ 0.2625 | $ 0.7875 | $ 0.7875 |
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Series A Preferred Stock [Member]
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| Dividends Payable [Line Items] | ||||
| Preferred Stock, distributions declared per share | $ 0.4843749 | $ 0.4843749 | $ 1.4531247 | $ 1.4531247 |
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Series B Preferred Stock [Member]
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| Dividends Payable [Line Items] | ||||
| Preferred Stock, distributions declared per share | $ 0.46875 | $ 0.46875 | $ 1.40630 | $ 1.40630 |
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Series C Preferred Stock [Member]
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| Dividends Payable [Line Items] | ||||
| Preferred Stock, distributions declared per share | $ 0.4453125 | $ 0.4453125 | $ 1.3359000 | $ 1.1875000 |