SUBSEQUENT EVENTS (Details) $ in Millions		1 Months Ended
Jul. 20, 2020 USD ($)	Jul. 29, 2021 USD ($) facility
New York
Subsequent Events
Aggregate purchase price	$ 9.5
Subsequent event \| Assets in New Jersey and Pennsylvania
Subsequent Events
Number of self-storage facilities acquired \| facility		2
Aggregate purchase price		$ 33.0

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration