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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share, Convertible Preferred Stock (Detail) (Convertible Preferred Stock Excluded from EPS [Member])
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Convertible Preferred Stock Excluded from EPS [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares excluded from EPS 32,400 346,400 32,400 346,400