Goodwill and Intangible Assets (Weighted Average Amortization Period by Intangible Asset Class) (Detail)	12 Months Ended
	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	6 years 7 months 6 days
Trademarks and patents
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	3 years 4 months 24 days
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	5 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	7 years 8 months 12 days
Covenant-not-to-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	2 years 6 months