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Income Taxes - Additional Information (Detail) (USD $)
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6 Months Ended | ||
|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Income Tax Disclosure [Abstract] | |||
| Accruals for interest or penalties related to income tax matters | $ 0 | $ 0 | |
| Effective income tax rate | 0.00% | 303.00% | |
| Difference of effective income tax rate and Federal statutory rate | 34.00% | ||
| Income tax benefit | 1,500,000 | ||
| Proceeds from sale | $ 18,600,000 | ||