Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) D Number_of_Visits	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
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	60.00%		64.00%
Revenue adjustment to Medicare revenue	$ 1,700	$ 1,500
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	11.60%
Asset Impairment Charges	$ 0	75,193
Property Plant And Equipment [Line Items]
Internally developed computer software				$ 75,800
Unamortized debt issuance costs	(3,200)		$ (3,400)
Home Health [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Asset Impairment Charges	0	0
Hospice [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Asset Impairment Charges	0	$ 0
Cap Year Two Thousand Thirteen Through Two Thousand Sixteen [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Estimated amounts due back to Medicare	$ 1,300		$ 1,400