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Cash Distribution Declared Distributions Reinvested and Distribution Per Share (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jul. 29, 2011
Dividends Payable [Line Items]      
Percentage of cash distribution considered as return of capital 100.00% 98.10%  
Percentage of cash distribution considered as taxable income   1.90%  
Common stock offering price $ 10.00   $ 10.00
Stock distributions as a percentage of total distribution declared 43.00%    
Cash distributions as a percentage of total distribution declared 57.00%