Revenue Recognition - Schedule of Revenues Disaggregated by Service Line (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total services	$ 136,028,000	$ 146,970,000	$ 265,628,000	$ 297,109,000
Patient Management Services [Member]
Disaggregation Of Revenue [Line Items]
Total services	90,250,000	95,715,000	175,471,000	195,202,000
Network Solutions Services [Member]
Disaggregation Of Revenue [Line Items]
Total services	$ 45,778,000	$ 51,255,000	$ 90,157,000	$ 101,907,000