Income Per Share Data - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014 Subsequent Event [Member]	Dec. 31, 2013 Open Market Stock Repurchase Program [Member]
Earnings Loss Per Share [Line Items]
Weighted average diluted shares outstanding excluded outstanding stock options	400,000	700,000
Common stock repurchased, Shares	380,011	0
Common stock repurchased	$ 8,900,000			$ 500,000
Amount available for repurchase of shares	2,600,000
Amount used to repurchase common stock	$ 9,424,000		$ 2,600,000