Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2016 USD ($) D Number_of_Visits	Sep. 30, 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	99.00%	98.00%		99.00%	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%		64.00%
Revenue adjustment to Medicare revenue	$ 1,600	$ 1,500		$ 5,900	$ 4,000
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
Asset Impairment Charges	0	2,075	$ 75,200	$ 0	77,268
Property Plant And Equipment [Line Items]
Internally developed computer software							$ 75,800
Unamortized debt issuance costs	(2,800)			(2,800)		$ (3,400)
Home Health [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Asset Impairment Charges	0	0		0	0
Hospice [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Asset Impairment Charges	0	$ 0		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	$ 1,000			$ 1,000		$ 1,400