Stock Based Compensation Expenses (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 4,509,727	$ 4,029,022	$ 3,008,567
Income tax benefit	(1,820,473)	(1,511,541)	(1,107,679)
Net stock-based compensation expense	2,689,254	2,517,481	1,900,888
Cost of portal revenues, exclusive of depreciation & amortization
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	907,684	1,066,714	882,415
Cost of software & services revenues, exclusive of depreciation and amortization
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	63,099	57,636	26,327
Selling & administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 3,538,944	$ 2,904,672	$ 2,099,825