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Segment and Geographic Information - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Segment Reporting Information    
Revenue $ 2,720,764 $ 2,342,843
Number of operating segments 4  
Number of reportable segments 3  
North America    
Segment Reporting Information    
Revenue $ 1,329,843 1,208,240
Number of reportable segments 1  
Europe    
Segment Reporting Information    
Revenue $ 1,040,430 820,897
Specialty    
Segment Reporting Information    
Revenue $ 351,792 $ 314,934