Earnings per Share - Weighted Average Shares and Share Equivalents to Calculate Basic and Diluted Earnings Per Share (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 shares outstanding used to calculate basic EPS	4,588,000	4,999,000	4,817,000	5,049,000
Dilutive Securities:
Stock options and restricted share units	107,000	133,000	125,000	118,000
Weighted average number of shares and share equivalents used to calculate diluted EPS	4,695,000	5,132,000	4,942,000	5,167,000