Stock Based Compensation Expenses (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 3,802,572	$ 4,509,727	$ 4,029,022
Income tax benefit	(1,482,857)	(1,820,473)	(1,511,541)
Net stock-based compensation expense	2,319,715	2,689,254	2,517,481
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	997,340	907,684	1,066,714
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	61,845	63,099	57,636
Selling & administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 2,743,387	$ 3,538,944	$ 2,904,672