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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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     56,734  
Retirement of senior common stock, net     (24)  
Distributions declared to common, senior common and preferred stockholders     (37,130)  
Comprehensive income     172  
Net income $ 2,383 $ (73) 7,403 $ 1,665
Stockholders' equity, ending balance $ 267,032   $ 267,032  
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)     2,785,303  
Issuance of Series A and B preferred stock and common stock, net     $ 3  
Conversion of senior common stock to common stock (in shares)     26,563  
Stockholders' equity, ending balance (in shares) 27,694,624   27,694,624  
Stockholders' equity, ending balance $ 28   $ 28  
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)     (29,762)  
Retirement of senior common stock, net (in shares)     (1,598)  
Stockholders' equity, ending balance (in shares) 928,192   928,192  
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     56,731  
Retirement of senior common stock, net     (24)  
Stockholders' equity, ending balance 520,143   520,143  
Accumulated Other Comprehensive Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance     0  
Comprehensive income     172  
Stockholders' equity, ending balance 172   172  
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     (37,130)  
Net income     7,403  
Stockholders' equity, ending balance $ (253,314)   $ (253,314)