Acquisitions and Disposals - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) Agency	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business Combination, Consideration Transferred \| $	$ 11,900
Payments to Acquire Businesses, Gross \| $	$ 10,880	$ 10,400
LifePoint [Member]
Business Acquisition [Line Items]
Number of home health agencies acquired	12
Number of hospice agencies acquired	7
Number of in-patient hospice unit agencies acquired	1

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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