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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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Oct. 07, 2014
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Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Oct. 22, 2014 |
| Payment Date | Oct. 31, 2014 |
| Payable to the Holders of Records During the Month | October |
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Subsequent Event A [Member] | Common Stock [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Nov. 17, 2014 |
| Payment Date | Nov. 26, 2014 |
| Payable to the Holders of Records During the Month | November |
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Subsequent Event B [Member] | Common Stock [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Record Date | Dec. 19, 2014 |
| Payment Date | Dec. 31, 2014 |
| Payable to the Holders of Records During the Month | December |
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Subsequent Event C [Member] | Common Stock [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.1250000 |
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Subsequent Event [Member] | Common Stock [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 |
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Senior Common Stock [Member] | Subsequent Event A [Member]
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| Dividends Payable [Line Items] | |
| Payment Date | Nov. 07, 2014 |
| Distribution per Share | $ 0.0875 |
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Senior Common Stock [Member] | Subsequent Event B [Member]
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| Dividends Payable [Line Items] | |
| Payment Date | Dec. 05, 2014 |
| Distribution per Share | $ 0.0875 |
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Senior Common Stock [Member] | Subsequent Event C [Member]
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| Dividends Payable [Line Items] | |
| Payment Date | Jan. 08, 2015 |
| Distribution per Share | $ 0.0875 |
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Senior Common Stock [Member] | Subsequent Event [Member]
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| Dividends Payable [Line Items] | |
| Distribution per Share | $ 0.2625 |