Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2016
Customer relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 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	5 years
Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years
Product Development Costs
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	4 years