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Other Intangible Assets, net and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]          
Amortization   $ (53,241) $ (40,932) $ (102,353) $ (97,038)
Customer First Now          
Finite-Lived Intangible Assets [Line Items]          
Asset acquisition, consideration transferred $ 6,446        
Finite-Lived Intangible Assets, Period Increase (Decrease) $ 6,446        
Remaining Weighted - Average Amortization Period (in years) 4 years 8 months 12 days        
Databases | Customer First Now          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Period Increase (Decrease) $ 5,446        
Remaining Weighted - Average Amortization Period (in years) 5 years        
Computer software | Customer First Now          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Period Increase (Decrease) $ 1,000        
Remaining Weighted - Average Amortization Period (in years) 3 years