Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Common Stock [Member]
Jan. 31, 2013
Common Stock [Member]
Jan. 31, 2013
IPO [Member]
Sep. 30, 2013
IPO [Member]
Subsidiary, Sale of Stock [Line Items]            
IPO of shares of common stock         3,333,334  
Public offering price       $ 15.00    
Gross proceeds from IPO $ 50.0          
Net proceeds after deducting offering expenses     45.1      
Underwriters exercised their option to purchase an additional shares           446,930
Additional gross proceeds from IPO           6.7
Additional net proceeds from IPO           6.2
Invested in New property Acquisition           4.6
Expended or accrued for capital improvements           0.6
Accumulated earnings and profits 9.6          
Dividend declared or paid   $ 0        
Deferred intercompany gain from land transfer $ 4.0