Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Number of reporting units	3
Amortization of intangibles	$ 1,279	$ 1,334
Content
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
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	5 years
Minimum | Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	2 years
Minimum | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	4 years
Maximum | Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	5 years
Maximum | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful life	7 years