Summary of Activity Related to Goodwill (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets [Line Items]
Beginning balance	$ 208,915,000	$ 209,600,000	$ 334,700,000
Additions		1,000,000	32,800,000
Goodwill, Written off Related to Sale of Business Unit	(3,300,000)	(400,000)
Goodwill, Impairment Loss		(1,300,000)	(157,900,000)
Ending balance	205,587,000	208,915,000	209,600,000
Home Health [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	16,600,000	18,200,000	152,500,000
Additions		100,000	23,600,000
Goodwill, Written off Related to Sale of Business Unit	(100,000)	(400,000)
Goodwill, Impairment Loss		(1,300,000)	(157,900,000)
Ending balance	16,500,000	16,600,000	18,200,000
Hospice [Member]
Goodwill and Intangible Assets [Line Items]
Beginning balance	192,300,000	191,400,000	182,200,000
Additions		900,000	9,200,000
Goodwill, Written off Related to Sale of Business Unit	(3,200,000)	0
Goodwill, Impairment Loss		0	0
Ending balance	$ 189,100,000	$ 192,300,000	$ 191,400,000