Debt - Schedule of Company's Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Aug. 30, 2013
Debt Instrument [Line Items]
Term loan borrowed	$ 607,650	$ 253,190
Unamortized discount	(24,207)	(16,073)
Unamortized debt issuance expense	(12,044)	(4,114)
Net carrying value	571,399	233,003
TaxACT - HD Vest 2015 credit facility [Member]
Debt Instrument [Line Items]
Term loan borrowed	400,000	0
Unamortized discount	(12,000)	0
Unamortized debt issuance expense	(8,919)	0
Net carrying value	379,081	0
TaxACT 2013 credit facility [Member]
Debt Instrument [Line Items]
Term loan borrowed	0	51,940	$ 71,400
Unamortized discount	0	0
Unamortized debt issuance expense	0	0
Net carrying value	0	51,940
Convertible senior notes [Member]
Debt Instrument [Line Items]
Term loan borrowed	201,250	201,250
Unamortized discount	(12,207)	(16,073)
Unamortized debt issuance expense	(3,125)	(4,114)
Net carrying value	185,918	181,063
President [Member] | Notes payable, other payables [Member]
Debt Instrument [Line Items]
Term loan borrowed	6,400	0
Unamortized discount	0	0
Unamortized debt issuance expense	0	0
Net carrying value	$ 6,400	$ 0