Real Estate and Lending Activities - Assets Acquired (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Business Acquisition [Line Items]
Total assets acquired	$ 6,492
Land [Member]
Business Acquisition [Line Items]
Total assets acquired	169
Building [Member]
Business Acquisition [Line Items]
Total assets acquired	5,327
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Total assets acquired	$ 996

Amount of assets acquired at the acquisition date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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