Quarterly Operating Results (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Portal revenues	$ 66,435,417	$ 70,122,162	$ 71,030,846	$ 65,913,898	$ 62,148,395	$ 65,304,664	$ 66,807,907	$ 61,482,452	$ 273,502,323	$ 255,743,418	$ 235,183,005
Software & services revenues	4,723,198	4,924,120	4,781,930	4,444,725	3,869,507	4,222,534	4,345,879	3,915,233	18,873,973	16,353,153	14,095,660
Total revenues	71,158,615	75,046,282	75,812,776	70,358,623	66,017,902	69,527,198	71,153,786	65,397,685	292,376,296	272,096,571	249,278,665
Operating expenses:
Cost of portal revenues, exclusive of depreciation & amortization	42,798,666	41,057,942	42,815,102	41,494,301	39,984,873	39,090,865	39,550,094	37,559,503	168,166,011	156,185,335	147,007,246
Cost of software & services revenues, exclusive of depreciation & amortization	1,456,122	1,364,726	1,321,259	1,289,860	1,258,356	1,287,083	1,244,843	993,324	5,431,967	4,783,606	4,498,233
Selling & administrative	11,165,707	10,576,445	10,818,680	10,537,491	9,490,401	10,396,876	9,840,579	9,208,685	43,098,323	38,936,541	36,881,346
Depreciation & amortization	1,673,405	2,116,319	2,303,571	2,292,118	2,357,854	2,292,382	2,277,048	2,249,734	8,385,413	9,177,018	8,333,089
Total operating expenses	57,093,900	55,115,432	57,258,612	55,613,770	53,091,484	53,067,206	52,912,564	50,011,246	225,081,714	209,082,500	196,719,914
Operating income before income taxes	14,064,715	19,930,850	18,554,164	14,744,853	12,926,418	16,459,992	18,241,222	15,386,439	67,294,582	63,014,071
Income tax provision	5,080,726	7,180,660	7,250,724	5,803,949	4,634,174	6,098,567	7,213,057	6,010,054	25,316,059	23,955,852	20,520,660
Net income	$ 8,983,989	$ 12,750,190	$ 11,303,440	$ 8,940,904	$ 8,292,244	$ 10,361,425	$ 11,028,165	$ 9,376,385	$ 41,978,523	$ 39,058,219	$ 32,038,091
Basic net income per share	$ 0.13	$ 0.19	$ 0.17	$ 0.14	$ 0.12	$ 0.16	$ 0.17	$ 0.14	$ 0.63	$ 0.59	$ 0.49
Diluted net income per share	$ 0.13	$ 0.19	$ 0.17	$ 0.14	$ 0.12	$ 0.16	$ 0.17	$ 0.14	$ 0.63	$ 0.59	$ 0.49
Weighted average shares outstanding:
Basic	65,621,684	65,617,812	65,587,822	65,387,427	65,301,797	65,287,702	65,244,575	65,056,725	65,554,655	65,223,549	64,888,978
Diluted	65,715,951	65,636,436	65,587,822	65,387,427	65,363,104	65,287,702	65,244,575	65,056,725	65,639,682	65,277,758	64,954,366