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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%

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