Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified										12 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Enterprise Software Solutions [Member]	Dec. 31, 2012 Enterprise Software Solutions [Member]	Dec. 31, 2011 Enterprise Software Solutions [Member]	Dec. 31, 2013 Appraisal And Tax Software Solutions And Services [Member]	Dec. 31, 2012 Appraisal And Tax Software Solutions And Services [Member]	Dec. 31, 2011 Appraisal And Tax Software Solutions And Services [Member]	Dec. 31, 2012 Akanda Innovation, Inc. [Member]	Dec. 31, 2012 Akanda Innovation, Inc. [Member] Appraisal And Tax Software Solutions And Services [Member]	Dec. 31, 2012 UniFund, L.L.C. [Member]	Dec. 31, 2012 UniFund, L.L.C. [Member] Enterprise Software Solutions [Member]	Dec. 31, 2012 CSA [Member]	Dec. 31, 2012 CSA [Member] Enterprise Software Solutions [Member]	Dec. 31, 2012 EnerGov Solutions, L.L.C. [Member]	Mar. 31, 2013 EnerGov Solutions, L.L.C. [Member]	Dec. 31, 2012 EnerGov Solutions, L.L.C. [Member] Enterprise Software Solutions [Member]
Goodwill [Line Items]
Goodwill Beginning Balance	$ 121,011	$ 121,011	$ 106,094	$ 114,454	$ 114,454	$ 100,504	$ 6,557	$ 6,557	$ 5,590								$ 1,100
Goodwill acquired										967	967	1,055	1,055	4,634	4,634	8,261		8,261
Goodwill Ending Balance	$ 121,011	$ 121,011	$ 106,094	$ 114,454	$ 114,454	$ 100,504	$ 6,557	$ 6,557	$ 5,590								$ 1,100