Significant Accounting Policies - Percentage of Net Service Revenue Contributed from Each Reporting Segment (Detail) - Sales Revenue, Segment	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	100.00%	100.00%
Home health services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	72.50%	75.90%
Hospice Services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	13.90%	8.70%
Community-based services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	4.70%	5.10%
Facility-based services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	8.90%	10.30%