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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue $ 528,869 $ 563,973 $ 1,630,218 $ 1,622,661
Americas        
Disaggregation of Revenue [Line Items]        
Revenue 211,247 228,326 636,723 665,731
EMEA        
Disaggregation of Revenue [Line Items]        
Revenue 195,230 207,168 618,921 587,942
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Revenue $ 122,392 $ 128,479 $ 374,574 $ 368,988