Goodwill and Intangible Assets - Summary of Assigned Lives and Weighted Average Amortization Periods by Intangible Asset Category (Detail)	9 Months Ended
	Sep. 30, 2015
Customer Contracts and Relationships [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	5 years
Patents and Technology [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	4 years 6 months
Trademarks and Trade Names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	4 years 8 months 12 days
Other [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	4 years 4 months 24 days
Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Minimum [Member] | Customer Contracts and Relationships [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	4 years
Minimum [Member] | Patents and Technology [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	3 years
Minimum [Member] | Trademarks and Trade Names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	3 years
Minimum [Member] | Other [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	8 years
Maximum [Member] | Customer Contracts and Relationships [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Maximum [Member] | Patents and Technology [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Maximum [Member] | Trademarks and Trade Names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	8 years
Maximum [Member] | Other [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years