Goodwill and Intangible Assets - Intangible Assets - Finite Lived (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 91,408	$ 86,825
Accumulated Amortization	61,771	55,542
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	14,457	14,457
Accumulated Amortization	13,008	10,686
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	73,199	68,943
Accumulated Amortization	48,959	44,484
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	6,578	5,294
Accumulated Amortization	1,758	1,154
Foreign Currency Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	(2,826)	(1,869)
Accumulated Amortization	$ (1,954)	$ (782)