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Organization (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2012
sqft
Building
Jan. 13, 2012
Dec. 31, 2011
Feb. 16, 2010
Private placement [Member]
Feb. 13, 2012
Public follow-on offering [Member]
Jan. 13, 2012
Public follow-on offering [Member]
Feb. 13, 2012
Additional offering [Member]
Feb. 16, 2010
Initial public offering [Member]
Feb. 16, 2010
Initial public offering [Member]
Private placement [Member]
Organization (Textual) [Abstract]                  
Number of buildings owned by Company 54                
Square feet of buildings 4,200,000                
Common stock, shares issued 13,434,889 4,000,000 9,308,670 350,000   4,000,000 61,853 8,750,000  
Common stock price per share   $ 14.25   $ 20.00   $ 14.25 $ 14.25 $ 20.00  
Proceeds of offering, after deducting underwriting discount and offering costs         $ 54.7        
Net proceeds of the IPO and the concurrent private placement                 $ 169.8