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Held for Sale and Discontinued Operations - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 19, 2019
USD ($)
Dec. 05, 2017
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 18, 2019
USD ($)
clinic
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Loss on sale of discontinued operations before taxes           $ (24,248) $ (23,022)  
Proceeds from sale of DMG division $ 4,465,476              
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 3,824,509              
Gain (Loss) on Disposition of Business           (16,252) 0 $ 60,603
Payments to Acquire Businesses, Gross           182,013 100,861 183,156
Series of individually immaterial business acquisitions                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Payments to Acquire Businesses, Gross           182,013 98,836 176,161
DMG Acquisitions | Series of individually immaterial business acquisitions                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of businesses acquired | clinic         2      
Payments to Acquire Businesses, Gross         $ 2,025     6,995
Business combination, deferred purchase price         $ 212     1,142
Discontinued Operations, Held-for-sale | DMG - discontinued operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Business acquisition, effective date of acquisition Jun. 19, 2019              
Purchase And Sale Agreement Aggregate Purchase Price $ 4,340,000              
Business Acquisition, Date of Acquisition Agreement   Dec. 05, 2017            
Loss on sale of discontinued operations before taxes           $ (7,996) $ (23,022) $ 0
Additional Payment To The Buyer Related To The Final Agreement On The Purchase Price     $ 47,000          
Gain (Loss) on Disposition of Business     $ (17,976)          
Discontinued Operations, Held-for-sale | DMG - discontinued operations | Coronavirus Aid Relief And Economic Security Act Additional Tax Benefit Member [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain (Loss) on Disposition of Business       $ 9,980