Significant Accounting Policies - Percentage of Net Service Revenue Contributed from Each Reporting Segment (Detail) - Sales Revenue, Segment	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Home health services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	72.20%	76.60%	72.40%	76.30%
Hospice Services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	15.00%	9.30%	14.40%	9.00%
Community-based services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	4.70%	5.10%	4.70%	5.10%
Facility-based services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	8.10%	9.00%	8.50%	9.60%