Earnings per Share - Weighted Average Shares and Share Equivalents to Calculate Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS	4,889,000	5,106,000	4,934,000	5,075,000
Dilutive Securities:
Stock options and restricted share units	124,000	115,000	133,000	116,000
Weighted average number of shares and share equivalents used to calculate diluted EPS	5,013,000	5,221,000	5,067,000	5,191,000