Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2018 shares	Jun. 30, 2018 Group time PeriodicRate shares	Dec. 31, 2017 shares
Accounting Policies [Abstract]
Common stock, authorized | shares	60,000,000	60,000,000	40,000,000
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%	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%