Summary of Activity Related to Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets [Line Items]
Beginning balance	$ 261,663	$ 205,600	$ 208,900
Additions	27,100	56,100
Goodwill, Written off Related to Sale of Business Unit			(3,300)
Adjustments related to acquisitions	100
Ending balance	288,957	261,663	205,600
Home Health [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	67,100	16,500	16,600
Additions	4,400	50,600
Goodwill, Written off Related to Sale of Business Unit			(100)
Adjustments related to acquisitions	100
Ending balance	71,600	67,100	16,500
Hospice [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	194,600	189,100	192,300
Additions	0	5,500
Goodwill, Written off Related to Sale of Business Unit			(3,200)
Adjustments related to acquisitions	0
Ending balance	194,600	194,600	189,100
Personal Care [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	0	0	0
Additions	22,700	0
Goodwill, Written off Related to Sale of Business Unit			0
Adjustments related to acquisitions	0
Ending balance	$ 22,700	$ 0	$ 0