Summary of Significant Accounting Policies - Amortization of Intangible Assets, Useful Life (Detail)	12 Months Ended
	Dec. 31, 2013
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	5 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	11 years
Research Content [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	1 year
Research Content [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	2 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	7 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets, useful life	1 year