Cash Distribution Declared Distributions Reinvested and Distribution Per Share (Parenthetical) (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Jul. 29, 2011
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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% |