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Income Per Common Share - Antidilutive Securities Excluded from Computation of Earning Per Share (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted earning per share 250,016 254,000 918,349 254,000
Convertible Preferred Socks [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted earning per share     666,666  
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted earning per share 250,016 254,000 251,683 254,000