Real Estate Activities and Lending Activities - Rent Deferrals - Additional Information (Detail) - COVID-19 Pandemic [Member] $ in Millions	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Deferred lease income	$ 7
Percentage of deferred revenue lease	2.00%

Amount of deferred lease income, classified as noncurrent. Includes, but is not limited to, amount paid in advance by lessee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.26)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DeferredRevenueLeasesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant