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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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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Threshold period past due for trade accounts receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Trade receivable payments period.

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