Description of Business and Summary of Significant Accounting Policies - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 952,404	$ 946,685
Additions for current year acquisitions	11,241	17,931
Adjustments for final purchase accounting	725	741
Foreign currency translation adjustments	(15,333)	(12,953)
Goodwill, ending balance	$ 949,037	$ 952,404