Real Estate and Lending Activities - Net Assets Acquired (Parenthetical) (Detail)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible lease assets (in years)	30 years 9 months 18 days	26 years 7 months 6 days

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration