Earnings Per Share - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS	4,050	4,196	4,058	4,336
Dilutive securities:
Stock options and restricted share units	246	158	210	153
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	4,296	4,354	4,268	4,489