Summary of Major Classes of Line Items Constituting Income (Loss) of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cost of revenue:
(Loss) income from discontinued operations before income taxes	$ 0	$ (13,857)	$ 0	$ (32,980)
Income tax benefit (provision)	0	2,152	0	7,627
Loss from discontinued operations, net of tax	$ 0	(11,705)	$ 0	(25,353)
Horizon Clinicals and Series2000 [Member]
Revenue:
Total revenue		0		9,845
Cost of revenue:
Total cost of revenue		0		3,152
Gross profit		0		6,693
Research and development		0		1,651
(Loss) income from discontinued operations before income taxes		0		5,042
Income tax benefit (provision)		0		(1,311)
Loss from discontinued operations, net of tax		0		3,731
Horizon Clinicals and Series2000 [Member] | Software delivery, Support and Maintenance [Member]
Revenue:
Total revenue		0		9,441
Cost of revenue:
Total cost of revenue		0		2,322
Horizon Clinicals and Series2000 [Member] | Client services [Member]
Revenue:
Total revenue		0		404
Cost of revenue:
Total cost of revenue		$ 0		$ 830