Summary of Significant Accounting Policies - Percentage of Net Service Revenue Contributed from Each Reporting Segment (Detail) - Sales Revenue, Segment [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	100.00%	100.00%	100.00%
Home health services [Member]
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	75.10%	77.00%	79.50%
Hospice Entity [Member]
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	10.50%	9.20%	8.50%
Community-Based Services [Member]
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	5.10%	3.80%	0.50%
Facility-based services [Member]
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	9.30%	10.00%	11.50%