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Stockholders' Equity - Dividend Distributions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Class of Stock [Line Items] |  |  |  |
Distributions Per Share | $ 0.085 | $ 0 | $ 0.255 | $ 0
Total Dividend/Distribution |  |  | $ 29,074 |
Total Dividend/Distribution |  |  | 7,506 |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Distributions Per Share |  |  | $ 0.255 |
Total Dividend/Distribution |  |  | 29,074 |
Series F Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividend/Distribution per Share |  |  | $ 4,242.04 |
Total Dividend/Distribution |  |  | 2,121 |
Series G Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividend/Distribution per Share |  |  | $ 5,427.00 |
Total Dividend/Distribution |  |  | 1,357 |
Series J Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividend/Distribution per Share |  |  | $ 5,085.12 |
Total Dividend/Distribution |  |  | 2,034 |
Series K Preferred Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividend/Distribution per Share |  |  | $ 9,968.85 |
Total Dividend/Distribution |  |  | $ 1,994 |

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