Significant Accounting Policies - Percentage of Net Service Revenue Contributed from Each Reporting Segment (Detail) (Sales Revenue, Segment)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	100.00%	100.00%	100.00%	100.00%
Home- Based Services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	81.30%	80.60%	80.60%	80.00%
Hospice Services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	9.10%	8.60%	9.10%	8.30%
Facility- Based Services
Health Care Organization, Revenue [Abstract]
Percentage of net service revenue	9.60%	10.80%	10.30%	11.70%