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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS	3,900	4,066	3,892	4,062
Dilutive securities:
Stock options and restricted share units	265	196	259	187
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	4,165	4,262	4,151	4,249