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
Mar. 31, 2018
Mar. 31, 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 643  
Retirement of senior common stock, net (34)  
Distributions declared to common, senior common and preferred stockholders (13,474)  
Comprehensive income 495  
Net income 4,605 $ 4,356
Stockholders' equity, ending balance $ 259,033  
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  
Stockholders' equity, ending balance $ 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) 31,011  
Issuance of Series A and B preferred stock and common stock, net $ 0  
Conversion of senior common stock to common stock (in shares) 8,881  
Stockholders' equity, ending balance (in shares) 28,423,908  
Stockholders' equity, ending balance $ 28  
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) (10,522)  
Retirement of senior common stock, net (in shares) (2,266)  
Stockholders' equity, ending balance (in shares) 892,031  
Stockholders' equity, ending balance $ 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 643  
Retirement of senior common stock, net (34)  
Stockholders' equity, ending balance 535,399  
Accumulated Other Comprehensive Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Stockholders' equity, beginning balance 35  
Comprehensive income 495  
Stockholders' equity, ending balance 530  
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 (13,474)  
Net income 4,605  
Stockholders' equity, ending balance $ (276,927)