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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Series A Preferred Stock    
Class of Stock [Line Items]    
Distributions per Preferred Share (in dollars per share) $ 1.59375 $ 1.59375
Series B Preferred Stock    
Class of Stock [Line Items]    
Distributions per Preferred Share (in dollars per share) 0.875 0
Common Stock    
Class of Stock [Line Items]    
Distributions per Common Share (in dollars per share) $ 0.5319 $ 0.5238