Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 Group time PeriodicRate
Accounting Policies [Abstract]
Percentage equity ownership, license Leasing Arrangements	100.00%
Number of Medicare home health resource groups | Group	153
Number of days from date RAP paid to submit final Medicare bill	60 days
Medicare sequestration reduction for episodes beginning after March 31, 2013	2.00%
Low utilization adjustment visits | time	5
Selected hospice, periodic rate used to calculate revenue	1
Number of hospice, periodic rates used to calculate revenue	4
Minimum percentage of Medicare reimbursement from inpatient care services that subjects individual programs to inpatient cap	20.00%
Determination period for hospice Medicare inpatient reimbursement cap	12 months
Medicare credit risk for accounts receivable	50.00%
Reimbursement for initial episode of care	60.00%
Number of days from start of episode to submit final Medicare bill	120 days
Reimbursement for subsequent episodes of care	50.00%