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Earnings (Loss) Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Anti-dilutive shares outstanding 5,274,900 5,274,900 5,274,900 5,274,900 5,274,900 5,274,900