Summary of Major Classes of Line Items Constituting Income (Loss) of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cost of revenue:
Income from discontinued operations before income taxes	$ 0	$ (5,016)
Income tax benefit (provision)	0	1,662
Loss from discontinued operations, net of tax	$ 0	(3,354)
Horizon Clinicals and Series2000 [Member]
Revenue:
Total revenue		10,296
Cost of revenue:
Total cost of revenue		3,206
Gross profit		7,090
Research and development		1,124
Income from discontinued operations before income taxes		5,966
Income tax benefit (provision)		(1,551)
Loss from discontinued operations, net of tax		4,415
Horizon Clinicals and Series2000 [Member] | Software delivery, Support and Maintenance [Member]
Revenue:
Total revenue		9,804
Cost of revenue:
Total cost of revenue		2,463
Horizon Clinicals and Series2000 [Member] | Client services [Member]
Revenue:
Total revenue		492
Cost of revenue:
Total cost of revenue		$ 743