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Summary of Significant Accounting Policies - Definite lived Intangible Assets Amortization Expense (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Minimum [Member] | Customer Lists and Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years	5 years	5 years
Minimum [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years	2 years	2 years
Maximum [Member] | Customer Lists and Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years	15 years	15 years
Maximum [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	7 years	7 years	7 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- 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

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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