Debt - Schedule of Company's Debt (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Aug. 30, 2013
Debt Instrument [Line Items]
Principal amount	$ 266,634,000	$ 322,634,000
Unamortized discount	(18,133,000)	(19,955,000)	(200,000)
Net carrying value	248,501,000	302,679,000
Monoprice Credit Facility
Debt Instrument [Line Items]
Principal amount	46,000,000	50,000,000
Unamortized discount	(230,000)	(288,000)
Net carrying value	45,770,000	49,712,000
TaxACT 2013 credit facility
Debt Instrument [Line Items]
Principal amount	19,384,000	71,384,000
Unamortized discount	0	0
Net carrying value	19,384,000	71,384,000
Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount	201,250,000	201,250,000
Unamortized discount	(17,903,000)	(19,667,000)
Net carrying value	$ 183,347,000	$ 181,583,000