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INVESTMENT ACTIVITY (Details)										1 Months Ended	3 Months Ended							12 Months Ended
	Dec. 16, 2019 USD ($)	Sep. 17, 2019 USD ($)	Sep. 06, 2019 USD ($)	Aug. 08, 2019 USD ($)	Jun. 28, 2019 USD ($)	Jun. 25, 2019 USD ($)	Jun. 06, 2019 USD ($) property	Jun. 05, 2019 USD ($) property	Jan. 31, 2018 USD ($)	Nov. 30, 2018 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) property	Mar. 31, 2020 USD ($) facility	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 item	Dec. 31, 2015 item	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) property	Dec. 31, 2019 USD ($) facility	Dec. 31, 2019 USD ($)
Self-storage facilities
Aggregate purchase price																						$ 118,300,000
Number of facilities, construction completed and opened																		$ 3
Total Construction Costs																		90,600,000
Acquisition of noncontrolling interest															$ 10,000,000
HVP III
Self-storage facilities
Percentage of interest acquired							90.00%
Texas
Self-storage facilities
Cash paid for acquisition									$ 200,000
Issuance of OP Shares									4,800,000
Total consideration									$ 12,200,000
California
Self-storage facilities
Cash paid for acquisition	$ 14,900,000
Issuance of OP Shares	3,600,000
Total consideration	$ 18,500,000
Self storage under construction
Self-storage facilities
Number of facilities under contract | property												5
Self storage under construction | New York
Self-storage facilities
Number of facilities under contract | facility													2
Self storage under construction | Massachusetts
Self-storage facilities
Number of facilities under contract | facility													1
Self storage under construction | Virginia
Self-storage facilities
Number of facilities under contract | property												1
Self storage under construction | Pennsylvania
Self-storage facilities
Number of facilities under contract | facility													1
Self-storage Facility in Waltham, MA
Self-storage facilities
Cash paid for acquisition			$ 2,600,000
Percentage of interest acquired			10.00%
Number of facilities, construction completed and opened																		$ 1
Ownership interest held by the entity (as a percent)				90.00%														100.00%
Total Construction Costs																		$ 18,000,000
Acquisition of noncontrolling interest				$ 2,000,000.0
Repayments of debt				$ 10,500,000
Self Storage Facility in Queens, NY I
Self-storage facilities
Cash paid for acquisition					$ 9,000,000.0
Percentage of interest acquired					10.00%
Acquisition of noncontrolling interest					$ 22,600,000
Repayments of debt					12,400,000
Self Storage Facility in Bayonne, NJ
Self-storage facilities
Number of facilities, construction completed and opened																		$ 1
Ownership interest held by the entity (as a percent)																		100.00%
Total Construction Costs																		$ 25,100,000
Self Storage Facility in Brooklyn, NY I
Self-storage facilities
Cash paid for acquisition						$ 18,500,000
Percentage of interest acquired						10.00%
Ownership interest held by the entity (as a percent)																	90.00%
Number of joint ventures | item																	2
Self Storage Facilities in Waltham, MA and New York, NY
Self-storage facilities
Acquisition, gain (loss) recognized			$ 0
Self Storage Facilities in Brooklyn NY, and Queens NY
Self-storage facilities
Acquisition, gain (loss) recognized					$ 0
Self-storage Facility in Queens, NY
Self-storage facilities
Number of facilities, construction completed and opened																		$ 1
Ownership interest held by the entity (as a percent)																		100.00%
Total Construction Costs																		$ 47,500,000
2020 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired												1	1
Aggregate purchase price														$ 9,025,000
Deposit											$ 2,700,000	$ 2,700,000	$ 2,700,000	2,700,000				2,700,000
Expected aggregate purchase or sales price											65,700,000	$ 65,700,000	65,700,000	65,700,000				65,700,000
Number of facilities under contract | property												2
2020 Acquisitions | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases											$ 40,000,000	$ 40,000,000	40,000,000	40,000,000				40,000,000
Estimated life											12 months
Amortization expense														32,000
2019 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired																				11	29
Aggregate purchase price																						246,600,000
Cash paid for acquisition																						14,900,000
Issuance of OP Shares																						3,600,000
2019 Acquisitions | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases																			$ 6,200,000	$ 6,200,000	$ 6,200,000	6,200,000
Estimated life																			12 months
Amortization expense														1,500,000	$ 100,000
2019 Acquisitions | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							18
Cash paid for acquisition							$ 120,000,000.0
Percentage of interest acquired							90.00%
Acquisition of remaining interest in real estate ventures (as a percent)							10.00%
Total consideration							$ 128,300,000
Amount of escrowed proceeds from sale of assets							8,300,000
Acquisition, assets recorded							137,500,000
Acquistion, previously held equity interest							10,600,000
Acquisition, cash acquired							1,400,000
Acquisition, gain (loss) recognized							$ 0
2019 Acquisitions | HVP III | Leases, Acquired-in-Place
Self-storage facilities
Estimated life							12 months
Amortization expense														3,600,000
2019 Acquisitions | Texas
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | Florida
Self-storage facilities
Number of self-storage facilities acquired | property																				5
2019 Acquisitions | Massachusetts | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							7
2019 Acquisitions | Maryland
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | California
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | Arizona
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | Georgia
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | Georgia | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							1
2019 Acquisitions | North Carolina | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							1
2019 Acquisitions | South Carolina
Self-storage facilities
Number of self-storage facilities acquired | property																				1
2019 Acquisitions | South Carolina | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							7
2019 Acquisitions | Tennessee | HVP III
Self-storage facilities
Number of self-storage facilities acquired | property							2
2019 Acquisitions | HVP III
Self-storage facilities
Number of assets sold | property								50
2019 Acquisitions | Maryland Asset March 2019
Self-storage facilities
Number of self-storage facilities acquired | facility																					1
Aggregate purchase price																						22,000,000
2019 Dispositions
Self-storage facilities
Aggregate sale price																						$ 4,146,000
2019 Dispositions | HVP III | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases							$ 14,300,000
2019 Dispositions | Texas
Self-storage facilities
Aggregate sale price										$ 4,100,000
Gain from sale of real estate, net										$ 1,500,000
Real Estate Acquisitions Expected in 2019 | Self storage under construction
Self-storage facilities
Development costs											$ 85,300,000	$ 85,300,000	$ 85,300,000	85,300,000				$ 85,300,000
Expected construction cost														$ 137,600,000
Real Estate Acquisitions Expected in 2019 | Self storage under construction | Massachusetts
Self-storage facilities
Number of facilities under contract | facility													1
Joint Venture | Self-storage Facility in Waltham, MA
Self-storage facilities
Minority ownership interest (as a percent)				0.00%
Joint Venture | Self Storage Facility in Queens, NY I
Self-storage facilities
Minority ownership interest (as a percent)					0.00%
Joint Venture | Self Storage Facility in Bayonne, NJ
Self-storage facilities
Ownership interest held by the entity (as a percent)																51.00%
Number of joint ventures | item																2
Put option ownership percentage in joint venture exercised (as a percent)		49.00%				49.00%
Option to put ownership interest in the venture		$ 15,200,000				$ 11,500,000
HVP III
Self-storage facilities
Number of self-storage facilities acquired | property								50
Aggregate sale price								$ 293,500,000
Gain from sale of real estate, net								$ 106,700,000
Ownership interest held by the entity (as a percent)								90.00%
HVP III | Florida
Self-storage facilities
Number of assets sold | property								(3)
HVP III | Georgia
Self-storage facilities
Number of assets sold | property								(4)
HVP III | North Carolina
Self-storage facilities
Number of assets sold | property								(3)
HVP III | South Carolina
Self-storage facilities
Number of assets sold | property								(15)
HVP III | Tennessee
Self-storage facilities
Number of assets sold | property								(8)

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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