Goodwill and Intangible Assets, Net - Components of Intangible Assets with Definite Lives (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 8 months 12 days
Gross Carrying Amount	$ 36,214	$ 21,382
Accumulated Amortization	(14,672)	(13,492)
Intangible assets with definite lives, net	21,542	7,890
Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	8 years 4 months 24 days
Gross Carrying Amount	17,975	14,431
Accumulated Amortization	(7,462)	(9,029)
Intangible assets with definite lives, net	10,513	5,402
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 1 month 6 days
Gross Carrying Amount	13,835	5,617
Accumulated Amortization	(5,858)	(3,511)
Intangible assets with definite lives, net	7,977	2,106
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	2 years 8 months 12 days
Gross Carrying Amount	4,404	1,334
Accumulated Amortization	(1,352)	(952)
Intangible assets with definite lives, net	$ 3,052	$ 382