Results of Operations of the Acquired Business Included in the Company's Consolidated Statements of Income (Detail) (USD $)	3 Months Ended								12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2009 TexasOnline (a Division of Bearing Point, Inc)	Dec. 31, 2009 TexasOnline (a Division of Bearing Point, Inc)
Business Acquisition [Line Items]
Portal revenues	$ 42,288,106	$ 43,850,010	$ 43,783,252	$ 40,355,066	$ 38,744,664	$ 39,763,232	$ 39,481,631	$ 37,186,137	$ 170,276,434	$ 155,175,664	$ 128,573,539		$ 19,756,049
Operating expenses:
Cost of portal revenues, exclusive of depreciation & amortization	25,824,503	27,122,489	26,362,294	25,420,650	24,685,746	23,686,305	23,884,902	23,295,163	104,729,936	95,552,116	76,336,220		13,693,055
Nonrecurring gain on acquisition of business, net of tax											(2,184,255)	(2,184,255)	(2,184,255)
Amortization of acquisition-related intangible assets	80,769	80,769	80,769	80,769	80,769	80,769	80,769	80,769	323,076	323,076	4,130,256		4,130,256
Depreciation and amortization	1,214,324	1,167,347	1,109,318	1,084,423	1,048,302	1,108,406	1,114,892	1,082,148	4,575,412	4,353,748	4,035,410		24,281
Total operating expenses	35,432,327	35,708,959	36,981,012	34,268,801	32,786,916	32,472,261	34,186,297	32,690,271	142,391,099	132,135,745	110,864,885		15,663,337
Income before income taxes	9,591,681	10,970,239	9,443,532	8,467,800	8,022,761	9,248,247	6,550,298	5,567,251	38,473,252	29,388,557	22,072,549		4,092,712
Income tax expense	(4,068,644)	(4,139,018)	(3,910,303)	(3,412,805)	(2,964,128)	(3,196,085)	(2,620,676)	(2,244,621)	(15,530,770)	(11,025,510)	(8,126,556)		(721,778)
Net income	$ 5,523,037	$ 6,831,221	$ 5,533,229	$ 5,054,995	$ 5,058,633	$ 6,052,162	$ 3,929,622	$ 3,322,630	$ 22,942,482	$ 18,363,047	$ 13,945,993		$ 3,370,934