Significant Accounting Policies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) Group time PeriodicRate
Summary Of Significant Accounting Policies [Line Items]
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
Low utilization adjustment visits | time	5
Medicare sequestration reduction for episodes beginning after March 31, 2013	2.00%
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%
Excess tax benefits | $	$ 0.9