Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 2,139	$ 1,279
Trade Name | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	2 years
Trade Name | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	5 years
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	4 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	7 years
Content | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	1 year 6 months
Content | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	4 years
Software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	3 years
Non-Compete | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	4 years
Non-Compete | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	5 years