Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 91,455	$ 86,825
Accumulated Amortization	58,819	55,542
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	14,457	14,457
Accumulated Amortization	11,842	10,686
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	73,199	68,943
Accumulated Amortization	46,551	44,484
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	5,878	5,294
Accumulated Amortization	1,424	1,154
Foreign Currency Adjustments [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	(2,079)	(1,869)
Accumulated Amortization	$ (998)	$ (782)