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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Payments to Acquire Intangible Assets $ 333,846 $ 327,553
Customer-Related Intangible Assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired finite-lived intangible assets, weighted average useful life 15 years