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Acquisitions - Schedule of Cash Paid and Acquired for Acquisitions (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
acquisition
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
acquisition
Business Combination, Separately Recognized Transactions [Line Items]      
Cash acquired $ (37,837) $ (2,064)  
Net cash paid $ 1,033,695 $ 68,920  
Series of Individually Immaterial Business Acquisitions      
Business Combination, Separately Recognized Transactions [Line Items]      
Number of acquisitions | acquisition 12   6
Cash paid at closing $ 1,071,532   $ 98,298
Cash acquired (37,837)   (5,266)
Net cash paid 1,033,695   $ 93,032
Escrow deposit $ 7,050