Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 94,868	$ 91,408
Accumulated Amortization	63,847	61,771
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	14,457	14,457
Accumulated Amortization	13,183	13,008
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	73,199	73,199
Accumulated Amortization	50,221	48,959
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	9,728	6,578
Accumulated Amortization	2,001	1,758
Foreign Currency Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	(2,516)	(2,826)
Accumulated Amortization	$ (1,558)	$ (1,954)