Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2018
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	8 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	2 years
Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years
Product Development Costs | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	5 years
Product Development Costs | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years