Business Combinations - Additional Information (Detail) (USD $)			1 Months Ended	0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended	3 Months Ended			0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	May 31, 2012 Stock Option	May 30, 2014 HSW	May 30, 2014 HSW	May 30, 2014 HSW Media Content	May 30, 2014 HSW Media Content	May 30, 2014 HSW Proprietary Technology	May 30, 2014 HSW Proprietary Technology	Aug. 22, 2013 Monoprice, Inc	Sep. 30, 2014 Monoprice, Inc	Dec. 31, 2013 Monoprice, Inc	Aug. 22, 2013 Monoprice, Inc	Aug. 22, 2013 Monoprice, Inc Stock Option	Aug. 22, 2013 Monoprice, Inc RSUs vested	Aug. 22, 2013 Monoprice, Inc Performance-based restricted stock units (PSUs)	Aug. 22, 2013 Monoprice, Inc Business To Consumer Customer Relationships	Aug. 22, 2013 Monoprice, Inc Business To Business Customer Relationships	Aug. 22, 2013 Monoprice, Inc Personal Property Assets	Oct. 04, 2013 Balance Financial	Oct. 04, 2013 Balance Financial	May 30, 2014 Trade Names HSW
Business Acquisition [Line Items]
Cash paid for acquisition				$ 44,900,000						$ 182,909,000										$ 4,900,000
Business acquisition identifiable net assets acquired					4,500,000								26,091,000								1,000,000
Business acquisition Identifiable net asset acquired consisting intangible assets and deferred tax					25,400,000		18,200,000		1,300,000				68,900,000								800,000	5,900,000
Estimates lives of acquired intangible assets						10 years		4 years									2 years	7 years	6 years
Goodwill acquired	364,054,000	348,957,000			15,100,000								115,601,000								3,100,000
Date of acquisition				May 30, 2014						Aug. 22, 2013										Oct. 04, 2013
Indemnifications related to general representations and warranties																					700,000
Escrow period expire date																				Apr. 04, 2015
Working capital adjustment												400,000
Acquisition costs													700,000
Options, restricted stock units and performance stock units granted during the period to Monoprice employees			190,000											27,152	126,259	243,750
Change in amount of liability											(700,000)
Gross contractual amount of trade accounts receivable acquired													3,200,000
Fair value of deferred revenue acquiree													1,300,000
Book value of deferred revenue prior to acquisition													$ 2,000,000