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Breakdown of Revenue and Non-Current Assets by Geographical Areas - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
market
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
market
Jun. 30, 2018
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]        
Number of geographical markets | market 3   3  
Revenue $ 528,147 $ 537,185 $ 1,086,270 $ 1,101,349
Sales Revenue, Net        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Concentration risk, percentage     1.40% 2.40%
France        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 35,200 $ 37,000 $ 72,600 $ 78,400