REPORTABLE SEGMENT AND RELATED INFORMATION - Summary of Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 84,533	$ 80,373	$ 253,036	$ 239,573
Costs & expenses	62,637	58,311	187,011	173,414
Depreciation & amortization	1,810	1,674	5,111	5,074
Operating income before income taxes	20,086	20,388	60,914	61,085
Operating segments | Outsourced Portals
Segment Reporting Information [Line Items]
Revenues	76,434	74,997	232,963	223,707
Costs & expenses	47,377	45,140	143,326	134,878
Depreciation & amortization	670	792	2,023	2,498
Operating income before income taxes	28,387	29,065	87,614	86,331
Operating segments | Other Software & Services
Segment Reporting Information [Line Items]
Revenues	8,099	5,376	20,073	15,866
Costs & expenses	3,169	1,495	6,803	4,353
Depreciation & amortization	25	23	72	55
Operating income before income taxes	4,905	3,858	13,198	11,458
Other reconciling items
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Costs & expenses	12,091	11,676	36,882	34,183
Depreciation & amortization	1,115	859	3,016	2,521
Operating income before income taxes	$ (13,206)	$ (12,535)	$ (39,898)	$ (36,704)