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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,682	3,612	3,673	3,610
Dilutive securities:
Stock options and restricted share units (in shares)	179	347	208	352
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	3,861	3,959	3,881	3,962