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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 537,185 $ 542,022 $ 1,101,349 $ 1,058,688
Americas        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 212,781 229,392 425,476 437,405
EMEA        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 201,080 191,682 423,691 380,774
Asia-Pacific        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 123,324 $ 120,948 $ 252,182 $ 240,509