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Accounts Receivable - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |
Trade receivable payments terms (30 days or less) | 30 days |
Threshold period past due for write-off of trade accounts receivable | 150 days |
Revolving line-of-credit facility under 2016 Credit Agreement |  |
Concentration Risk [Line Items] |  |
Receivables with revolving credit balances | $ 19.5 | $ 12.2
29 days or less past due | Credit Concentration Risk | Accounts receivable, net |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 97.00% | 95.00%
59 days or less past due | Credit Concentration Risk | Accounts receivable, net |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 99.00% | 97.00%

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