Quarterly report pursuant to Section 13 or 15(d)

Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail)

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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]        
Dividends Payable $ 3   $ 3  
Series A Preferred Stock        
Class of Stock [Line Items]        
Distributions per Preferred Share (in dollars per share) $ 0.3984375 $ 0.3984375 $ 0.7968750 $ 0.7968750
Series B Preferred Stock        
Class of Stock [Line Items]        
Distributions per Preferred Share (in dollars per share) 0.125 0.000 0.125 0.000
Common Stock        
Class of Stock [Line Items]        
Distributions per Common Share (in dollars per share) $ 0.13290 $ 0.13050 $ 0.26565 $ 0.25950