Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Preferred Stock, Shares Issued, beginning balance     2,150,000  
Preferred Stock, Shares Issued, ending balance 2,150,000   2,150,000  
Senior Common stock, Shares Issued, beginning balance     809,411  
Senior Common stock, Shares Issued, ending balance 993,069   993,069  
Common Stock, Shares Issued, beginning balance     19,589,606  
Common Stock, Shares Issued, ending balance 21,743,779   21,743,779  
Total Stockholders' Equity, beginning balance     $ 217,672  
Issuance of senior common stock and common stock, net     38,655  
Distributions declared to common, senior common and preferred stockholders     (27,305)  
Principal repayments of employee notes receivable     375  
Net income $ (96) $ 229 1,030 $ (12,066)
Total Stockholders' Equity, ending balance 230,427   $ 230,427  
Senior Common Stock [Member]        
Issuance of common stock, net, Shares     183,658  
Total Stockholders' Equity, beginning balance     $ 1  
Total Stockholders' Equity, ending balance 1   1  
Preferred Stock [Member]        
Total Stockholders' Equity, beginning balance     2  
Total Stockholders' Equity, ending balance 2   $ 2  
Common Stock [Member]        
Issuance of common stock, net, Shares     2,154,173  
Total Stockholders' Equity, beginning balance     $ 20  
Issuance of senior common stock and common stock, net     2  
Total Stockholders' Equity, ending balance 22   22  
Additional Paid in Capital [Member]        
Total Stockholders' Equity, beginning balance     369,748  
Issuance of senior common stock and common stock, net     38,653  
Total Stockholders' Equity, ending balance 408,401   408,401  
Notes Receivable from Employees [Member]        
Total Stockholders' Equity, beginning balance     (375)  
Principal repayments of employee notes receivable     375  
Distributions in Excess of Accumulated Earnings [Member]        
Total Stockholders' Equity, beginning balance     (151,724)  
Distributions declared to common, senior common and preferred stockholders     (27,305)  
Net income     1,030  
Total Stockholders' Equity, ending balance $ (177,999)   $ (177,999)