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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     $ 239,877  
Issuance of Series A and B preferred stock and common stock, net     17,887  
Distributions declared to common, senior common and preferred stockholders     (24,159)  
Other comprehensive income     179  
Net income $ 661 $ 883 5,020 $ 1,738
Stockholders' equity, ending balance $ 238,804   $ 238,804  
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)     24,882,758  
Stockholders' equity, beginning balance     $ 25  
Issuance of preferred stock and common stock, net (in shares)     855,238  
Issuance of Series A and B preferred stock and common stock, net     $ 1  
Conversion of senior common stock to common stock (in shares)     16,880  
Stockholders' equity, ending balance (in shares) 25,754,876   25,754,876  
Stockholders' equity, ending balance $ 26   $ 26  
Common Stock | Senior Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (in shares)     959,552  
Stockholders' equity, beginning balance     $ 1  
Conversion of senior common stock to common stock (in shares)     (18,768)  
Stockholders' equity, ending balance (in shares) 940,784   940,784  
Stockholders' equity, ending balance $ 1   $ 1  
Additional Paid in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     463,436  
Issuance of Series A and B preferred stock and common stock, net     17,886  
Stockholders' equity, ending balance 481,322   481,322  
Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     0  
Other comprehensive income     179  
Stockholders' equity, ending balance 179   179  
Distributions in Excess of Accumulated Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     (223,587)  
Distributions declared to common, senior common and preferred stockholders     (24,159)  
Net income     5,020  
Stockholders' equity, ending balance $ (242,726)   $ (242,726)