Real Estate Activities - HealthSouth Transaction - Additional Information (Detail) $ in Millions	Mar. 31, 2017 USD ($)	Jul. 20, 2016 USD ($) Hospital
Proceeds from sale of facilities	$ 64.0
Gain on real estate dispositions	$ 7.4
Encompass Health [Member]
Proceeds from sale of facilities		$ 111.5
Gain on real estate dispositions		$ 45.0
Encompass Health [Member] \| Texas [Member]
Number of hospitals sold \| Hospital		3

Cash received for the sale of real estate that is not part of an investing activity during the current period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration