Stockholders' Equity - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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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
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Stockholders Equity [Line Items] | |||
Stock distributions, shares | 157,449 | 15,196 | |
Reinvestment Plan
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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 |