Goodwill and Other Intangible Assets - Additional Information (Detail) (Weighted average)	9 Months Ended
	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period for definite-lived intangible assets	65 months
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period for definite-lived intangible assets	61 months
Technology intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period for definite-lived intangible assets	19 months
Media Content
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period for definite-lived intangible assets	116 months