Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) (USD $)
9 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Apr. 02, 2014
Maximum [Member]
Sep. 30, 2014
Common Stock [Member]
Jan. 28, 2013
Common Stock [Member]
Sep. 30, 2014
IPO [Member]
Jan. 28, 2013
IPO [Member]
Sep. 30, 2014
IPO [Member]
Dec. 31, 2013
IPO [Member]
Jan. 28, 2013
Follow-on Offering [Member]
Sep. 30, 2014
Follow-on Offering [Member]
Jan. 28, 2013
Follow-on Offering [Member]
Oct. 29, 2014
Over-Allotment Option [Member]
Subsequent Event [Member]
Oct. 24, 2014
Over-Allotment Option [Member]
Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]                              
Common stock shares issued         1,150,000     3,333,334              
Public offering price           $ 15.00                  
Gross proceeds from initial public offering $ 56,700,000                            
Additional common stock shares issued                 3,780,264           73,453
Net proceeds after deducting offering expenses         51,300,000           13,300,000     857,000  
Invested in new property acquisition                   37,900,000          
Expended or accrued for capital improvements                   1,700,000          
Distributions paid 1,763,171 5,224,211         10,300,000                
Uninvested proceed from initial public offering                 0            
Common stock, shares issued 7,680,264   6,530,264                   1,150,000    
Price per share                         $ 12.28    
Gross proceeds from issuance of common stock 14,100,000                   14,100,000     902,000  
Proceeds from common stock used for repayment of existing debt                     11,100,000        
Uninvested proceeds from stock offerings                       0      
Securities allowed for issuance       $ 300,000,000