Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) D Number_of_Visits	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Episode of care as episodic-based revenue, days | D	60
Percentage of total reimbursement of outlier payment	10.00%
Low utilization payment adjustment, maximum number of visits | Number_of_Visits	5
First threshold of therapy services required, visits | Number_of_Visits	6
Second threshold of services required, visits | Number_of_Visits	14
Third threshold of therapy services required, visits | Number_of_Visits	20
Historical collection rate from Medicare	99.00%
Episodes in progress that begin during reporting period, days | D	60
Hospice Medicare revenue rate accounted for routine care	98.00%	98.00%
Percentage of patient receivables outstanding	10.00%
Minimum days for accounts receivable outstanding to be fully reserved | D	365
Portion of accounts receivable derived from Medicare	58.00%		61.00%
Revenue adjustment to Medicare revenue | $	$ 3,400	$ 1,700
Rate of request for anticipated payment submitted for the initial episode of care	60.00%
Rate of request for anticipated payment submitted for subsequent episodes of care	50.00%
Maximum days to submit final bill from the start of episode | D	120
Maximum days to submit final bill from the date the request for anticipated payment was paid | D	60
Percentage Of Patient Receivables Outstanding Over Ten Percent	13.20%
Stockholders Equity Including Portion Attributable To Noncontrolling Interest | $	$ 482,946		$ 461,142
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Stockholders Equity Including Portion Attributable To Noncontrolling Interest | $	$ 400
Home Health [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Historical collection rate from Medicare	99.00%
Hospice [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Historical collection rate from Medicare	99.00%
Cap Year Two Thousand Thirteen Through Two Thousand Sixteen [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare | $			$ 800
Cap Year Two Thousand Thirteen Through Two Thousand Seventeen [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare | $	$ 900