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Acquisitions (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired $ 179,372 $ 76,511  
Goodwill 5,219,361   $ 4,959,658
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired 8,000    
Goodwill $ 7,000