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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Contract payment period | 15 days |
Contract liabilities | $ 0 |
Impairment loss | $ 0 | $ 0
Minimum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Transit time | 3 days |
Maximum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Transit time | 8 days |
Customer Concentration Risk | Sales Revenue |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Revenue from other services (as a percent) | 5.00% |

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