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Acquisitions (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired $ 76,511 $ 36,214  
Goodwill 5,145,477   $ 5,081,887
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Acquisition of businesses, net of cash acquired 77,000    
Goodwill 32,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 28,000