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Equity Compensation Plans - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Apr. 05, 2011
Jul. 29, 2013
Subsequent Event
Amended and Restated Equity Incentive Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Common stock, shares issuable 300,000,000 300,000,000   800,000
Shares issued to Directors     3,000  
Minimum proceeds from unaffiliated persons $ 2,500      
Selling commissions $ 0