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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS	3,858	4,050	3,881	4,058
Dilutive securities:
Stock options and restricted share units	267	246	261	210
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	4,125	4,296	4,142	4,268