Acquisitions - Schedule of Contingent and Non-Contingent Consideration Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition, Contingent Consideration [Line Items]
Accruals and other current liabilities	$ 6,900	$ 2,884
Accruals and other current liabilities	5,911	685
Series of Individually Immaterial Business Acquisitions
Business Acquisition, Contingent Consideration [Line Items]
Accruals and other current liabilities	6,900	2,884
Other liabilities	2,133	1,415
Contingent consideration from acquisitions	9,033	4,299
Accruals and other current liabilities	5,911	685
Other liabilities	5,876	1,774
Non-contingent consideration from acquisitions	$ 11,787	$ 2,459