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Goodwill, Trade Name, and Customer Lists - Summary Of Future Amortization Expense Of The Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2021   $ 72,921  
2022   66,184  
2023   59,672  
2024   53,759  
2025   47,662  
Thereafter   223,165  
Net Carrying Value $ 470,907 $ 523,363 $ 65,793