Quarterly report pursuant to Section 13 or 15(d)

Stockholders' and Mezzanine Equity - Dividends Paid (Detail)

v3.5.0.2
Stockholders' and Mezzanine Equity - Dividends Paid (Detail) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Common Stock [Member]        
Dividends Payable [Line Items]        
Common Stock, dividends paid per share $ 0.375 $ 0.375 $ 1.125 $ 1.125
Senior Common Stock [Member]        
Dividends Payable [Line Items]        
Common Stock, dividends paid per share 0.2625 0.2625 0.7875 0.7875
Series A Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.4843749 0.4843749 1.4531247 1.4531247
Series B Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.4688 0.4688 1.4063 1.4063
Series C Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.24244792 0.4453 1.133 1.3359
Series D Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share $ 0.4375 $ 0 $ 0.6163 $ 0