Goodwill and Intangible Assets - Summary of Assigned Lives and Weighted Average Amortization Periods by Intangible Asset Category (Detail)	9 Months Ended
	Sep. 30, 2013
Minimum [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
Customer contracts and relationships [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	5 years 1 month 6 days
Customer contracts and relationships [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	4 years
Customer contracts and relationships [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Patents and technology [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	5 years 2 months 12 days
Patents and technology [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Patents and technology [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years
Trademarks and trade names [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	7 years 4 months 24 days
Trademarks and trade names [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	3 years
Trademarks and trade names [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	8 years
Other [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Weighted Average Amortization Period	5 years 7 months 6 days
Other [Member] | Minimum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	1 year
Other [Member] | Maximum [Member]
Summary of assigned lives and weighted average amortization periods by intangible asset category
Assigned Life	6 years