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Revenues - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
country
customer
Jun. 30, 2018
Concentration Risk [Line Items]        
Number of customers | customer     500  
Number of countries in which customers are located (more than) | country     40  
Length of contract terms     We typically sell to customers under master service agreements, with one- to two-year terms on average, or by purchase orders.  
Duration of customer relationship     20 years  
10 Largest Customers | Customer Concentration Risk | Revenue from Contract with Customer        
Concentration Risk [Line Items]        
Concentration risk percentage 47.00% 45.00% 46.00% 45.00%
Shaw Industries Group Inc | Customer Concentration Risk | Revenue from Contract with Customer        
Concentration Risk [Line Items]        
Concentration risk percentage 19.00% 22.00% 21.00% 22.00%