Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, beginning balance	$ 152,020	$ 152,156
Acquisitions	9,017
Goodwill, foreign currency translation	315	(136)
Goodwill, ending balance	161,352	152,020
Tradename, beginning balance	14,291	18,258
Tradename, transfers to finite life classification	(700)	(3,904)
Tradename, foreign currency translation	103	(63)
Tradename, ending balance	$ 13,694	$ 14,291