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Acquisitions - Advanced Acquisition (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 14, 2019
Jun. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Cash consideration       $ 476,491,000 $ 247,906,000 $ 217,360,000
Goodwill       $ 864,485,000 $ 595,551,000 $ 438,506,000
Secured Debt | Term Loan Credit Facility            
Business Acquisition [Line Items]            
Maximum borrowing capacity $ 150,000,000          
Advanced Acquisition            
Business Acquisition [Line Items]            
Purchase price 211,743,000          
Cash consideration 201,121,000   $ 73,000      
Contingent earn-out based on future operating performance (up to) 20,000,000          
Fair value of contingent earn-out 10,622,000          
Purchase price, net of working capital adjustment   $ 211,816,000        
Fair value of tangible assets acquired   29,020,000        
Cash and restricted cash received   2,497,000        
Liabilities assumed   28,772,000        
Identified intangible assets $ 91,700,000 91,700,000        
Goodwill   119,868,000        
Goodwill expected to be tax deductible   $ 57,236,000        
Weighted average useful life of intangible assets 9 years