Segment Information - Information on Reportable Segments for Reconciliation to Consolidated Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Total revenues	$ 114,855	$ 124,121	$ 472,607	$ 406,640
Operating income:
Total operating income	(1,324)	6,127	61,066	63,763
Other loss, net	(3,208)	(13,118)	(11,001)	(20,427)
Income tax benefit (expense)	2,294	510	(17,579)	(17,803)
Net income (loss)	(2,238)	(6,481)	32,486	25,533
Operating Segments | Search and Content
Revenues
Total revenues	74,416	107,742	260,999	302,840
Operating income:
Total operating income	12,709	21,319	45,971	57,501
Operating Segments | Tax Preparation
Revenues
Total revenues	2,469	1,749	101,200	89,170
Operating income:
Total operating income	(1,859)	(1,605)	52,754	43,617
Operating Segments | E-Commerce
Revenues
Total revenues	37,970	14,630	110,408	14,630
Operating income:
Total operating income	3,336	906	9,192	906
Operating Segments | Corporate-level activity [Member]
Operating income:
Total operating income	$ (15,510)	$ (14,493)	$ (46,851)	$ (38,261)