Summary of Significant Accounting Policies - Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2020
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	6 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years
Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	4 years
Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	8 years
Product Development Costs | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	1 year
Product Development Costs | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years