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Held for Sale and Discontinued Operations - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Series of individually immaterial business acquisitions        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business combination, liabilities assumed   $ 23,748 $ 17,963 $ 7,452
Scenario, Forecast | DMG Acquisitions        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of DMG division $ 4,900,000,000      
DMG | Series of individually immaterial business acquisitions        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business combination, net cash received   135,416 398,748 41,918
Business combination, deferred purchase price   1,038   $ 944
Business combination, liabilities assumed   $ 10,145 $ 7,694