Stockholders' Equity - Additional Information (Detail) $ in Thousands						12 Months Ended
	Nov. 02, 2019 USD ($)	Aug. 22, 2019 shares	Aug. 22, 2019	Aug. 08, 2019	Dec. 18, 2018 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Nov. 02, 2017 USD ($)
Schedule Of Stockholders Equity [Line Items]
Stock split ratio		2	2	2
Change in number of common stock, shares authorized | shares		0
Stock issued for acquisition							$ 3,371
Stock split description						two-for-one stock split
Treasury stock at cost						$ 20,618	$ 19,864	$ 5,815
Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Stock issued for acquisition, Shares | shares							80,956
Stock split description						two-for-one stock split
Stock repurchase program, authorized amount	$ 50,000								$ 50,000
Repurchase of treasury shares | shares						417,564	579,490	244,294
Stock repurchase program, authorized repurchase amount expired	$ 3,700
Stock repurchase program, period	2 years
Stock repurchase program, available for future repurchases						$ 50,000
CovalentWorks [Member]
Schedule Of Stockholders Equity [Line Items]
Stock split ratio					2
Stock issued for acquisition, Shares | shares					80,956
Stock issued for acquisition					$ 3,400
Stock split description						two-for-one stock split