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Basic and Diluted Earnings Per Share - Summary of Basic and Diluted Common Shares Outstanding (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Weighted average number of basic common shares outstanding 7,150,000 7,007,000 7,085,000 7,959,000
Effect of dilutive securities 275,026 176,180 285,926 109,601
Weighted average number of diluted common shares outstanding 7,425,000 7,184,000 7,371,000 8,069,000