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Summary of Significant Accounting Policies - Schedule of estimated useful lives of intangible assets (Detail)	9 Months Ended
	Sep. 30, 2021
Customer-related intangible assets | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Customer-related intangible assets | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	11 years
Marketing-related intangible assets | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Marketing-related intangible assets | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	10 years
Technology-related intangible assets | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	2 years
Technology-related intangible assets | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	8 years

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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

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.

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