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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Beginning balance $ 317,676 $ 293,525  
Goodwill acquired 28,540 31,330  
Goodwill related to partnership interest sold 0 (7,325)  
Goodwill derecognition (write-off) related to closed clinics (1,859) 0 $ 0
Goodwill adjustments for purchase price allocation of businesses acquired in prior year 1,289 146  
Ending balance $ 345,646 $ 317,676 $ 293,525