Summary of Significant Accounting Policies - Summary of Tenant and Capital Reserves (Detail) - Accounts Payable and Other Liabilities [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Tenant reserve	$ 922	$ 774
Capital reserve	872	362
Tenant and capital reserves	$ 1,794	$ 1,136

Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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