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Stockholders' Equity - Dividends Declared (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Common Stock [Member]
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| Dividends Payable [Line Items] | |||
| Common Stock, distributions declared per share | $ 1.50 | $ 1.50 | $ 1.50 |
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Senior Common Stock [Member]
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| Dividends Payable [Line Items] | |||
| Common Stock, distributions declared per share | $ 1.05 | $ 1.05 | $ 1.05 |
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Series A Preferred Stock [Member]
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| Dividends Payable [Line Items] | |||
| Preferred Stock, distributions declared per share | $ 1.9374996 | $ 1.9374996 | $ 1.9374996 |
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Series B Preferred Stock [Member]
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| Dividends Payable [Line Items] | |||
| Preferred Stock, distributions declared per share | $ 1.8750 | $ 1.8750 | $ 1.8750 |
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Series C Preferred Stock [Member]
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| Dividends Payable [Line Items] | |||
| Preferred Stock, distributions declared per share | $ 1.7813 | $ 1.6328 | |