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Summary of Activity Related to Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets [Line Items]      
Beginning balance $ 205,587 $ 208,900 $ 209,600
Additions 56,100 0 1,000
Goodwill, Written off Related to Sale of Business Unit 0 (3,300) (400)
Goodwill, Impairment Loss   0 (1,300)
Ending balance 261,663 205,587 208,900
Home Health [Member]      
Goodwill and Intangible Assets [Line Items]      
Beginning balance 16,500 16,600 18,200
Additions 50,600 0 100
Goodwill, Written off Related to Sale of Business Unit 0 (100) (400)
Goodwill, Impairment Loss   0 (1,300)
Ending balance 67,100 16,500 16,600
Hospice [Member]      
Goodwill and Intangible Assets [Line Items]      
Beginning balance 189,100 192,300 191,400
Additions 5,500 0 900
Goodwill, Written off Related to Sale of Business Unit 0 (3,200) 0
Goodwill, Impairment Loss   0 0
Ending balance $ 194,600 $ 189,100 $ 192,300