Real Estate Activities - Other Leasing Activity - Additional Information (Detail) - Methodist [Member] - Texas [Member] $ in Millions		3 Months Ended
Jul. 24, 2020 USD ($) Property	Sep. 30, 2020 USD ($)
Business Acquisition [Line Items]
Total investments	$ 30.0
Number of re-leased properties \| Property	5
Straight-line rent and other write-off, net of tax		$ 1.5

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant