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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) (USD $)
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0 Months Ended |
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Jul. 15, 2014
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Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Jul. 25, 2014 |
| Payment Date | Aug. 05, 2014 |
| Payable to the Holders of Records During the Month | July |
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Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Aug. 20, 2014 |
| Payment Date | Aug. 29, 2014 |
| Payable to the Holders of Records During the Month | August |
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Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Sep. 19, 2014 |
| Payment Date | Sep. 30, 2014 |
| Payable to the Holders of Records During the Month | September |
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Senior Common Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.0875 |
| Payment Date | Aug. 07, 2014 |
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Senior Common Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.0875 |
| Payment Date | Sep. 08, 2014 |
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Senior Common Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.0875 |
| Payment Date | Oct. 07, 2014 |
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Senior Common Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.2625 |
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Common Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Common Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Common Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Common Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.3750000 |
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Series A Preferred Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1614583 |
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Series A Preferred Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1614583 |
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Series A Preferred Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1614583 |
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Series A Preferred Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.4843749 |
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Series B Preferred Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1562500 |
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Series B Preferred Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1562500 |
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Series B Preferred Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1562500 |
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Series B Preferred Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.4687500 |
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Series C Preferred Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1484375 |
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Series C Preferred Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1484375 |
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Series C Preferred Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1484375 |
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Series C Preferred Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.4453125 |