Quarterly report pursuant to Section 13 or 15(d)

Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail)

v3.10.0.1
Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     $ 266,798  
Issuance of Series A and B preferred stock and common stock, net     10,140  
Retirement of senior common stock, net     (34)  
Distributions declared to common, senior common and preferred stockholders     (40,615)  
Comprehensive income     1,028  
Net income $ 2,677 $ 2,383 9,807 $ 7,403
Stockholders' equity, ending balance $ 247,124   $ 247,124  
Series A and B Preferred Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (in shares)     2,264,000  
Stockholders' equity, beginning balance     $ 2  
Stockholders' equity, ending balance (in shares) 2,264,000   2,264,000  
Stockholders' equity, ending balance $ 2   $ 2  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (in shares)     28,384,016  
Stockholders' equity, beginning balance     $ 28  
Issuance of preferred stock and common stock, net (in shares)     526,323  
Issuance of Series A and B preferred stock and common stock, net     $ 1  
Conversion of senior common stock to common stock (in shares)     16,129  
Stockholders' equity, ending balance (in shares) 28,926,468   28,926,468  
Stockholders' equity, ending balance $ 29   $ 29  
Common Stock | Senior Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (in shares)     904,819  
Stockholders' equity, beginning balance     $ 1  
Conversion of senior common stock to common stock (in shares)     (19,548)  
Retirement of senior common stock, net (in shares)     (2,266)  
Stockholders' equity, ending balance (in shares) 883,005   883,005  
Stockholders' equity, ending balance $ 1   $ 1  
Additional Paid in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     534,790  
Issuance of Series A and B preferred stock and common stock, net     10,139  
Retirement of senior common stock, net     (34)  
Stockholders' equity, ending balance 544,895   544,895  
Accumulated Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     35  
Comprehensive income     1,028  
Stockholders' equity, ending balance 1,063   1,063  
Distributions in Excess of Accumulated Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     (268,058)  
Distributions declared to common, senior common and preferred stockholders     (40,615)  
Net income     9,807  
Stockholders' equity, ending balance $ (298,866)   $ (298,866)