Revenue Recognition - Schedule of Revenues Disaggregated by Service Line (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total services	$ 148,092,000	$ 146,082,000	$ 445,200,000	$ 444,656,000
Patient Management Services [Member]
Disaggregation Of Revenue [Line Items]
Total services	98,326,000	92,130,000	293,528,000	271,966,000
Network Solutions Services [Member]
Disaggregation Of Revenue [Line Items]
Total services	$ 49,766,000	$ 53,952,000	$ 151,672,000	$ 172,690,000