Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Dividends Declared (Detail)

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Stockholders' Equity - Dividends Declared (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Common Stock [Member]
   
Dividends Payable [Line Items]    
Common Stock, distributions declared per share $ 0.38 $ 0.38
Senior Common Stock [Member]
   
Dividends Payable [Line Items]    
Common Stock, distributions declared per share $ 0.26 $ 0.26
Series A Preferred Stock [Member]
   
Dividends Payable [Line Items]    
Preferred Stock, distributions declared per share $ 0.4843749 $ 0.4843749
Series B Preferred Stock [Member]
   
Dividends Payable [Line Items]    
Preferred Stock, distributions declared per share $ 0.4688 $ 0.4688
Series C Preferred Stock [Member]
   
Dividends Payable [Line Items]    
Preferred Stock, distributions declared per share $ 0.4453 $ 0.4453