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Stockholders' Equity - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Stockholders Equity [Line Items]      
Aggregate offering proceeds received from public offering $ 255,500,000   $ 168,100,000
Shares issued from public offering 25,900,000   16,900,000
Cash distribution declared 2,099,034 200,000 3,197,400
Percentage of cash distribution considered as return of capital 100.00% 100.00%  
Common Stock
     
Stockholders Equity [Line Items]      
Stock distributions, shares 157,449 15,196  
Reinvestment Plan
     
Stockholders Equity [Line Items]      
Aggregate offering proceeds received from public offering $ 2,900,000   $ 1,700,000
Shares issued from public offering 300,000   200,000