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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Common Stock [Member]        
Dividends Payable [Line Items]        
Common Stock, dividends paid per share $ 0.375 $ 0.375 $ 0.75 $ 0.75
Senior Common Stock [Member]        
Dividends Payable [Line Items]        
Common Stock, dividends paid per share 0.2625 0.2625 0.525 0.525
Series A Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.4843749 0.4843749 0.9687498 0.9687498
Series B Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.4688 0.4688 0.9375 0.9375
Series C Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share 0.4453 0.4453 0.8906 0.8906
Series D Preferred Stock [Member]        
Dividends Payable [Line Items]        
Preferred Stock, dividends paid per share $ 0.178763 $ 0 $ 0.178763 $ 0