Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' and Mezzanine Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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     3,521  
Retirement of senior common stock, net     (34)  
Distributions declared to common, senior common and preferred stockholders     (26,982)  
Comprehensive income     783  
Net income $ 2,525 $ 661 7,130 $ 5,020
Stockholders' equity, ending balance $ 251,216   $ 251,216  
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)     185,084  
Issuance of Series A and B preferred stock and common stock, net     $ 1  
Conversion of senior common stock to common stock (in shares)     9,554  
Stockholders' equity, ending balance (in shares) 28,578,654   28,578,654  
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)     (11,435)  
Retirement of senior common stock, net (in shares)     (2,266)  
Stockholders' equity, ending balance (in shares) 891,118   891,118  
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     3,520  
Retirement of senior common stock, net     (34)  
Stockholders' equity, ending balance 538,276   538,276  
Accumulated Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     35  
Comprehensive income     783  
Stockholders' equity, ending balance 818   818  
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     (26,982)  
Net income     7,130  
Stockholders' equity, ending balance $ (287,910)   $ (287,910)