Debt - TaxAct 2013 Credit Facility - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended	9 Months Ended				1 Months Ended	12 Months Ended								0 Months Ended
	Sep. 30, 2013	Aug. 30, 2013 TaxACT 2013 credit facility	Sep. 30, 2014 TaxACT 2013 credit facility	Dec. 31, 2013 TaxACT 2013 credit facility	Oct. 31, 2013 TaxACT 2013 credit facility	Sep. 30, 2013 TaxACT 2013 credit facility	Apr. 30, 2013 Tax Act Two Thousand Twelve Credit Facility [Member]	Dec. 31, 2012 Tax Act Two Thousand Twelve Credit Facility [Member]	Aug. 31, 2013 Tax Act Two Thousand Twelve Credit Facility [Member]	Aug. 30, 2013 Swing Line Loans TaxACT 2013 credit facility	Aug. 30, 2013 Letter of Credit TaxACT 2013 credit facility	Aug. 30, 2013 Revolving Credit Facility TaxACT 2013 credit facility	Aug. 30, 2013 August 30, 2014 Revolving Credit Facility TaxACT 2013 credit facility	Aug. 30, 2013 August 30, 2015 Revolving Credit Facility TaxACT 2013 credit facility	Aug. 30, 2013 August 30, 2016 Revolving Credit Facility TaxACT 2013 credit facility	Aug. 30, 2013 Minimum TaxACT 2013 credit facility	Aug. 30, 2013 Minimum London Interbank Offered Rate (LIBOR) TaxACT 2013 credit facility	Aug. 30, 2013 Maximum TaxACT 2013 credit facility	Aug. 30, 2013 Maximum London Interbank Offered Rate (LIBOR) TaxACT 2013 credit facility
Debt Instrument [Line Items]
Issuance Date		Aug. 30, 2013
Principal amount				$ 71,400,000	$ 6,000,000.0	$ 65,400,000		$ 100,000,000.0
Repayment Activities			52,000,000				10,000,000	25,500,000
Refinance Of Debt Facility									64,500,000
Derivative, Maturity Date	Sep. 10, 2013
Credit facility										10,000,000.0	5,000,000.0	100,000,000.0	90,000,000.0	80,000,000.0	70,000,000.0
Expiration Date		Aug. 30, 2018
Periodic Payment, Principal		3,000,000.0
Periodic Payment, Principal multiple		$ 1,000,000.0
Debt Instrument, Basis Spread on Variable Rate																0.75%	1.75%	1.50%	2.50%