Common Stock and Earnings Per Share - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 26, 2012 Common Stock [Member]	Dec. 31, 2013 Common Stock [Member]	Apr. 26, 2012 Common Stock [Member] Maximum [Member]
Net Income Per Share [Line Items]
Antidilutive potentially securities	58,800	198,300	205,113
Number of shares to be purchased by the company from shareholders						100
Number of shares purchased				14,634
Total cost paid by company associated with the Program and purchased				$ 453,654
Share repurchase program expiration date					2012-06