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INVESTMENT ACTIVITY (Details)														1 Months Ended	12 Months Ended			36 Months Ended
	Dec. 14, 2021 USD ($) item	Dec. 09, 2021 facility item	Jun. 29, 2021 USD ($)	Dec. 22, 2020 USD ($)	Sep. 29, 2020 USD ($) shares	Dec. 16, 2019 USD ($)	Oct. 07, 2019 USD ($)	Sep. 17, 2019 USD ($)	Sep. 06, 2019 USD ($) item	Sep. 05, 2019	Jun. 25, 2019 USD ($)	Jun. 06, 2019 USD ($) facility property	Jun. 05, 2019 USD ($) property	Jul. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) facility property shares	Dec. 31, 2020 USD ($) facility item shares	Dec. 31, 2019 USD ($) facility shares	Dec. 31, 2021 USD ($) property facility
Self-storage facilities
Gains from sales of real estate, net															$ 32,698,000	$ 6,710,000	$ 1,508,000
Number of facilities, construction completed and opened																		$ 8
Acquisition of noncontrolling interest															$ 3,397,000		$ 40,605,000
OP units redeemed | shares															5,500,000	100,000	80,000
Construction
Self-storage facilities
Total Construction Costs																		232,400,000
HVP III
Self-storage facilities
Number of self-storage facilities acquired | property												18
Percentage of interest acquired												90.00%
Texas
Self-storage facilities
Aggregate sale price							$ 4,100,000
Gains from sales of real estate, net							$ 1,500,000
New York
Self-storage facilities
Cash paid for acquisition					$ 1,000,000.0
Units issued (in shares) | shares					276,497
Units issued					$ 9,000,000.0
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 facilities under contract
Self-storage facilities
Deposit															$ 500,000			500,000
Expected aggregate purchase or sales price															$ 32,000,000.0			$ 32,000,000.0
Number of facilities under contract | facility															1			1
Self storage under construction
Self-storage facilities
Number of facilities under contract | property															3			3
Development costs															$ 66,700,000			$ 66,700,000
Expected construction cost															$ 97,300,000			$ 97,300,000
Self storage under construction | New York
Self-storage facilities
Number of facilities under contract | property															2			2
Self storage under construction | Virginia
Self-storage facilities
Number of facilities under contract | property															1			1
Self Storage Facility in Newton, MA
Self-storage facilities
Number of facilities, construction completed and opened																		$ 1
Self Storage Facility in Newton, MA | Construction
Self-storage facilities
Total Construction Costs																		20,800,000
Self-storage facility in East Meadow, NY
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self-storage facility in East Meadow, NY | Construction
Self-storage facilities
Total Construction Costs																		25,900,000
Self-storage facility in King of Prussia, PA
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self-storage facility in King of Prussia, PA | Construction
Self-storage facilities
Total Construction Costs																		22,800,000
Self-storage Facility in Brooklyn, NY
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self-storage Facility in Brooklyn, NY | Construction
Self-storage facilities
Total Construction Costs																		45,900,000
Self-storage Facility in Arlington, VA
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self-storage Facility in Arlington, VA | Construction
Self-storage facilities
Total Construction Costs																		26,400,000
Self-storage Facility in Waltham, MA
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self-storage Facility in Waltham, MA | Construction
Self-storage facilities
Total Construction Costs																		18,000,000
Self Storage Facility in Queens, NY I
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self Storage Facility in Queens, NY I | Construction
Self-storage facilities
Total Construction Costs																		47,500,000
Self Storage Facility in Bayonne, NJ
Self-storage facilities
Number of facilities, construction completed and opened																		1
Self Storage Facility in Bayonne, NJ | Construction
Self-storage facilities
Total Construction Costs																		25,100,000
2021 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility															66
Aggregate purchase price															$ 1,801,251,000
2021 Acquisitions | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility		57
Intangible value of the in-place leases															$ 109,700,000			109,700,000
Estimated life															12 months
Amortization expense															$ 9,100,000
Number of facilities under contract | facility		1
Number of joint ventures | item		2
2021 Acquisitions | Acquisitions | LAACO
Self-storage facilities
Percentage of interest acquired		50.00%
Ownership interest held by the entity (as a percent)		50.00%
2021 Acquisitions | Texas | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility		7
2021 Acquisitions | Nevada | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility		13
2021 Acquisitions | California | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility		20
2021 Acquisitions | Arizona | LAACO
Self-storage facilities
Number of self-storage facilities acquired | facility		17
2021 Acquisitions | Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired | facility															8
Aggregate purchase price															$ 140,800,000
Intangible value of the in-place leases															$ 11,900,000			11,900,000
Estimated life															12 months
Amortization expense															$ 3,600,000
2021 Acquisitions | Self-storage facilities located in US | Florida
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facilities located in US | Maryland
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facilities located in US | Nevada
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facilities located in US | Pennsylvania
Self-storage facilities
Number of self-storage facilities acquired | facility															2
2021 Acquisitions | Self-storage facilities located in US | New Jersey
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facilities located in US | Illinois
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facilities located in US | Georgia
Self-storage facilities
Number of self-storage facilities acquired | facility															1
2021 Acquisitions | Self-storage facility in Anoka, MN
Self-storage facilities
Aggregate purchase price															$ 12,000,000.0
Ownership interest held by the entity (as a percent)															50.00%
2021 Acquisitions | Self Storage Facility in Newton, MA
Self-storage facilities
Number of joint ventures | item	2
2021 Dispositions
Self-storage facilities
Number of self-storage facilities sold | facility															5
Aggregate sale price															$ 43,800,000
Gains from sales of real estate, net															32,700,000
2021 Dispositions | LAACO
Self-storage facilities
Gains from sales of real estate, net															$ 0
2021 Dispositions | Texas
Self-storage facilities
Number of self-storage facilities sold | facility															1
2021 Dispositions | Colorado
Self-storage facilities
Number of self-storage facilities sold | facility															1
2021 Dispositions | Nevada
Self-storage facilities
Number of self-storage facilities sold | facility															1
2021 Dispositions | North Carolina
Self-storage facilities
Number of self-storage facilities sold | facility															2
2020 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility																21
Aggregate purchase price																$ 735,875,000
2020 Acquisitions | Texas
Self-storage facilities
Number of self-storage facilities acquired | facility																3
2020 Acquisitions | Florida
Self-storage facilities
Number of self-storage facilities acquired | facility																5
2020 Acquisitions | New York
Self-storage facilities
Number of self-storage facilities acquired | facility																1
2020 Acquisitions | Maryland
Self-storage facilities
Number of self-storage facilities acquired | facility																1
2020 Acquisitions | Nevada
Self-storage facilities
Number of self-storage facilities acquired | facility																1
2020 Acquisitions | Virginia
Self-storage facilities
Number of self-storage facilities acquired | facility																1
2020 Acquisitions | New Jersey
Self-storage facilities
Number of self-storage facilities acquired | facility																1
2020 Acquisitions | Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired | facility																13
Aggregate purchase price																$ 195,900,000
2020 Acquisitions | Self-storage facilities located in US | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases																$ 11,400,000
Estimated life																12 months
Amortization expense															$ 9,300,000	$ 2,100,000
2020 Acquisitions | Self-storage Facility in Bronx, NY I
Self-storage facilities
Real estate property acquired, land subject to ground lease														$ 9,500,000
Decrease in right-of-use asset														5,100,000
Decrease in Operating Lease Liability														$ 5,000,000.0
2020 Acquisitions | Self-storage facilities located in New York
Self-storage facilities
Number of self-storage facilities acquired | facility																8
Number of real estate property acquisition tranches | item																2
Aggregate purchase price																$ 540,000,000.0
Cash paid for acquisition																210,500,000
Issuance of OP Shares																175,100,000
Repayments of debt																33,200,000
Units issued																$ 5,272,023
Number of properties, assumed mortgage | item																6
Assumed mortgage debt, at fair value																$ 169,200,000
Outstanding principal balance of mortgage debt assumed on acquisitions															154,400,000			$ 154,400,000
Premium on debt assumed on acquisitions																14,800,000
2020 Acquisitions | Self-storage facilities located in New York | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases																$ 48,600,000
Estimated life																12 months
Amortization expense															48,600,000
Number of assumed ground leases | item																3
Number of facilities acquired with existing ground leases, for which the leases were classified as finance leases | item																2
Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases | item																1
2020 Dispositions
Self-storage facilities
Aggregate sale price																$ 12,750,000
2020 Dispositions | Self-storage facilities located in New York
Self-storage facilities
Aggregate sale price				$ 12,800,000
Gains from sales of real estate, net				$ 6,700,000
2019 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired | facility																	29
Aggregate purchase price																	$ 246,600,000
2019 Acquisitions | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												18
Number of self-storage facilities sold | facility												50
Aggregate purchase price												$ 128,300,000
Intangible value of the in-place leases												$ 14,300,000
Estimated life												12 months
Amortization expense																6,000,000.0	$ 8,300,000
Percentage of interest acquired												90.00%
Acquisition of remaining interest in real estate ventures (as a percent)												10.00%
Acquisition, assets recorded												$ 137,500,000
Acquisition, previously held equity interest												10,600,000
Acquisition, cash acquired												$ 1,400,000
2019 Acquisitions | Texas
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | Florida
Self-storage facilities
Number of self-storage facilities acquired | facility																	5
2019 Acquisitions | Massachusetts | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												7
2019 Acquisitions | Maryland
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | California
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | Arizona
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | Georgia
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | Georgia | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												1
2019 Acquisitions | North Carolina | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												1
2019 Acquisitions | South Carolina
Self-storage facilities
Number of self-storage facilities acquired | facility																	1
2019 Acquisitions | South Carolina | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												7
2019 Acquisitions | Tennessee | HVP III
Self-storage facilities
Number of self-storage facilities acquired | facility												2
2019 Acquisitions | Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired | facility																	11
Aggregate purchase price																	$ 118,300,000
Cash paid for acquisition																	14,900,000
Issuance of OP Shares																	3,600,000
2019 Acquisitions | Self-storage facilities located in US | Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases																	$ 6,200,000
Estimated life																	12 months
Amortization expense															$ 0	$ 4,300,000	$ 1,900,000
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
Joint Venture | Self Storage Facilities in New York and New Jersey
Self-storage facilities
Number of joint ventures | item																4
Joint Venture | Self Storage Facility in Newton, MA
Self-storage facilities
Total consideration	$ 3,400,000
Ownership interest held by the entity (as a percent)	90.00%
Minority ownership interest (as a percent)	0.00%
Acquisition of noncontrolling interest	$ 2,700,000
Repayments of debt	$ 13,200,000
Joint Venture | Self Storage Facility in Newton, MA | Acquisitions
Self-storage facilities
Acquisition of remaining interest in real estate ventures (as a percent)	10.00%
Joint Venture | Self-storage facility in East Meadow, NY
Self-storage facilities
Put option ownership percentage in joint venture exercised (as a percent)			49.00%
Option to put ownership interest in the venture			$ 6,600,000
Joint Venture | Self-storage Facility in Brooklyn, NY
Self-storage facilities
Issuance of OP Shares					$ 9,000,000.0
Ownership interest held by the entity (as a percent)																51.00%
Units issued (in shares) | shares					276,497
Joint Venture | Self-storage Facility in Waltham, MA
Self-storage facilities
Total consideration									$ 2,600,000
Acquisition, gain (loss) recognized									$ 0
Ownership interest held by the entity (as a percent)										90.00%
Minority ownership interest (as a percent)									0.00%
Acquisition of noncontrolling interest									$ 2,000,000.0
Repayments of debt									$ 10,500,000
Number of joint ventures | item									2
Joint Venture | Self-storage Facility in Waltham, MA | Acquisitions
Self-storage facilities
Acquisition of remaining interest in real estate ventures (as a percent)									10.00%
Joint Venture | Self Storage Facility in Queens, NY I
Self-storage facilities
Put option ownership percentage in joint venture exercised (as a percent)								49.00%
Option to put ownership interest in the venture								$ 15,200,000
Joint Venture | Self Storage Facility in Bayonne, NJ
Self-storage facilities
Put option ownership percentage in joint venture exercised (as a percent)											49.00%
Option to put ownership interest in the venture											$ 11,500,000
Joint Venture | Self Storage Facility in Brooklyn, NY I
Self-storage facilities
Put option ownership percentage in joint venture exercised (as a percent)					49.00%
Option to put ownership interest in the venture					$ 10,000,000.0
Cash portion of put option paid					$ 1,000,000.0
Cubesmart | Self Storage Facility in Newton, MA
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
Cubesmart | Self-storage facility in East Meadow, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
Cubesmart | Self-storage facility in King of Prussia, PA
Self-storage facilities
Ownership interest held by the entity (as a percent)																		70.00%
Cubesmart | Self-storage Facility in Brooklyn, NY
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
Cubesmart | Self-storage Facility in Arlington, VA
Self-storage facilities
Ownership interest held by the entity (as a percent)																		90.00%
Cubesmart | Self-storage Facility in Waltham, MA
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
Cubesmart | Self Storage Facility in Queens, NY I
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
Cubesmart | Self Storage Facility in Bayonne, NJ
Self-storage facilities
Ownership interest held by the entity (as a percent)																		100.00%
HVP III
Self-storage facilities
Number of self-storage facilities sold | property													50
Aggregate sale price													$ 293,500,000
Gains from sales 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 self-storage facilities sold | property													3
HVP III | Georgia
Self-storage facilities
Number of self-storage facilities sold | property													4
HVP III | North Carolina
Self-storage facilities
Number of self-storage facilities sold | property													3
HVP III | South Carolina
Self-storage facilities
Number of self-storage facilities sold | property													15
HVP III | Tennessee
Self-storage facilities
Number of self-storage facilities sold | property													8
HVP III | 2019 Acquisitions
Self-storage facilities
Cash paid for acquisition												$ 120,000,000.0
Amount of escrowed proceeds from sale of assets												$ 8,300,000

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