XML 63 R52.htm IDEA: XBRL DOCUMENT
v3.25.2

INVESTMENTS IN UNCONSOLIDATED REAL ESTATE ENTITIES (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 USD ($) property jointVenture | Mar. 31, 2025 property | Feb. 04, 2025 USD ($) | May 31, 2023 USD ($) | Oct. 31, 2019 USD ($) | Jun. 30, 2025 USD ($) property | Mar. 31, 2025 USD ($) property | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) property | Jun. 30, 2024 USD ($) | Apr. 04, 2025 USD ($) | Dec. 31, 2024 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 414 |  |  |  | 414 |  |  |
Investment balance |  |  |  |  |  | $ 1,012,156 |  |  |  | $ 1,012,156 |  |  | $ 1,257,019
Investments in unconsolidated real estate entities |  |  |  |  |  | 1,088,983 |  |  |  | 1,088,983 |  |  | 1,332,338
Cash distributions in unconsolidated real estate ventures |  |  |  |  |  | (76,827) |  |  |  | (76,827) |  |  | (75,319)
Assumed debt |  |  |  |  |  | $ 258,000 | $ 0 | $ 0 | $ 0 | $ 258,000 | $ 0 |  |
PRISA Self Storage LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 85 |  |  |  | 85 |  |  |
Equity Ownership % |  |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |
Excess Profit % |  |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |
Investment balance |  |  |  |  |  | $ 8,815 |  |  |  | $ 8,815 |  |  | 8,967
HF1 Sovran HHF Storage Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 37 |  |  |  | 37 |  |  |
Equity Ownership % |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Investment balance |  |  |  |  |  | $ 302,275 |  |  |  | $ 302,275 |  |  | 304,526
HF1 Sovran HHF Storage Holdings LLC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
HF1 Sovran HHF Storage Holdings LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 59.00% |  |  |  | 59.00% |  |  |
Storage Portfolio II JV LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 36 |  |  |  | 36 |  |  |
Equity Ownership % |  |  |  |  |  | 10.00% |  |  |  | 10.00% |  |  |
Excess Profit % |  |  |  |  |  | 30.00% |  |  |  | 30.00% |  |  |
Investment balance |  |  |  |  |  | $ (10,085) |  |  |  | $ (10,085) |  |  | (9,584)
Storage Portfolio IV JV LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 32 |  |  |  | 32 |  |  |
Equity Ownership % |  |  |  |  |  | 10.00% |  |  |  | 10.00% |  |  |
Excess Profit % |  |  |  |  |  | 30.00% |  |  |  | 30.00% |  |  |
Investment balance |  |  |  |  |  | $ 46,626 |  |  |  | $ 46,626 |  |  | 47,150
Storage Portfolio I LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 24 |  |  |  | 24 |  |  |
Equity Ownership % |  |  |  |  |  | 34.00% |  |  |  | 34.00% |  |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Investment balance |  |  |  |  |  | $ (43,951) |  |  |  | $ (43,951) |  |  | (43,803)
ESS CA-TIVS JV LP |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Equity Ownership % |  |  |  |  |  | 55.00% |  |  |  | 55.00% |  |  |
Investment balance |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  | 27,217
ESS CA-TIVS JV LP | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 55.00% |  |  |  | 55.00% |  |  |
ESS CA-TIVS JV LP | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 65.00% |  |  |  | 65.00% |  |  |
HF2 Sovran HHF Storage Holdings II LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 22 |  |  |  | 22 |  |  |
Equity Ownership % |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
Investment balance |  |  |  |  |  | $ 113,120 |  |  |  | $ 113,120 |  |  | 114,034
HF2 Sovran HHF Storage Holdings II LLC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 49.00% |  |  |  | 49.00% |  |  |
HF2 Sovran HHF Storage Holdings II LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 59.00% |  |  |  | 59.00% |  |  |
HF5 Life Storage-HIERS Storage LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 17 |  |  |  | 17 |  |  |
Equity Ownership % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Investment balance |  |  |  |  |  | $ 24,842 |  |  |  | $ 24,842 |  |  | 25,192
HF6 191 V Life Storage Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 17 |  |  |  | 17 |  |  |
Equity Ownership % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Investment balance |  |  |  |  |  | $ 10,175 |  |  |  | $ 10,175 |  |  | 10,821
PR II EXR JV LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  | 6 |  |  |  | 0 | 6 |  |  | 0 |  |  |
Equity Ownership % |  | 25.00% |  |  |  |  | 25.00% |  |  |  |  |  |
Excess Profit % |  |  |  |  |  | 25.00% |  |  |  | 25.00% |  |  |
Investment balance |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  | 105,909
Number of properties acquired | property |  | 6 |  |  |  |  | 6 |  |  |  |  |  |
Number of properties exchanged | property |  | 17 |  |  |  |  | 17 |  |  |  |  |  |
Number of properties in portfolio | property |  | 23 |  |  |  |  | 23 |  |  |  |  |  |
Ownership percentage after transaction |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
PR II EXR JV LLC | Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  | 17 |  |  |  |  | 17 |  |  |  |  |  |
Number of properties acquired | property |  | 17 |  |  |  |  | 17 |  |  |  |  |  |
Equity ownership percentage exchanged |  | 75.00% |  |  |  |  | 75.00% |  |  |  |  |  |
Number of properties exchanged | property |  | 6 |  |  |  |  | 6 |  |  |  |  |  |
VRS Self Storage, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 16 |  |  |  | 16 |  |  |
Equity Ownership % |  |  |  |  |  | 45.00% |  |  |  | 45.00% |  |  |
Excess Profit % |  |  |  |  |  | 54.00% |  |  |  | 54.00% |  |  |
Investment balance |  |  |  |  |  | $ (18,226) |  |  |  | $ (18,226) |  |  | (17,557)
HF10 Life Storage HHF Wasatch Holdings LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 16 |  |  |  | 16 |  |  |
Equity Ownership % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Excess Profit % |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |  |
Investment balance |  |  |  |  |  | $ 18,620 |  |  |  | $ 18,620 |  |  | 19,295
Other unconsolidated real estate ventures |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | property |  |  |  |  |  | 112 |  |  |  | 112 |  |  |
Investment balance |  |  |  |  |  | $ 309,945 |  |  |  | $ 309,945 |  |  | 314,852
Other unconsolidated real estate ventures | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Ownership % |  |  |  |  |  | 10.00% |  |  |  | 10.00% |  |  |
Excess Profit % |  |  |  |  |  | 10.00% |  |  |  | 10.00% |  |  |
Other unconsolidated real estate ventures | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Ownership % |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |
Excess Profit % |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |
Strategic Storage Growth Trust III, Inc. Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment balance |  |  |  |  |  | $ 100,000 |  |  |  | $ 100,000 |  |  | 0
Strategic Storage Trust VI, Inc. Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment balance |  |  |  |  |  | 150,000 |  |  |  | 150,000 |  |  | 150,000
Dividend rate, percentage |  |  |  | 8.35% |  |  |  |  |  |  |  |  |
Dividend rate increase, threshold |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Redemption period |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Investment in shares |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |
SmartStop Self Storage REIT, Inc. Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment balance |  |  |  |  | $ 200,000 | $ 0 |  |  |  | $ 0 |  | $ 200,000 | $ 200,000
Investment, preferred dividend rate |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
ESS-NYFL JV LP and ESS-CA TIVS JV LP |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Ownership % | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Value of real estate asset acquired | $ 436,797 |  |  |  |  |  |  |  |  |  |  |  |
Assumed debt | $ 258,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property | 27 |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | jointVenture | 2 |  |  |  |  |  |  |  |  |  |  |  |
Strategic Storage Growth Trust III, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment balance |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  | 8.85% |  |  |  |  |  |  |  |  |  |
Dividend rate increase, threshold |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Redemption period |  |  | 5 years |  |  |  |  |  |  |  |  |  |

X
- Definition Asset Acquisition, Percentage Of Ownership After Transaction + References No definition available. + Details
Name: | exr_AssetAcquisitionPercentageOfOwnershipAfterTransaction
Namespace Prefix: | exr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Asset Acquisition, Real Estate Assets + References No definition available. + Details
Name: | exr_AssetAcquisitionRealEstateAssets
Namespace Prefix: | exr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash Distributions In Unconsolidated Real Estate Ventures + References No definition available. + Details
Name: | exr_CashDistributionsInUnconsolidatedRealEstateVentures
Namespace Prefix: | exr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Equity Method Investment, Number Of Properties + References No definition available. + Details
Name: | exr_EquityMethodInvestmentNumberOfProperties
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Method Investment, Number Of Properties Exchanged + References No definition available. + Details
Name: | exr_EquityMethodInvestmentNumberOfPropertiesExchanged
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Method Investment, Number Of Properties In Portfolio + References No definition available. + Details
Name: | exr_EquityMethodInvestmentNumberOfPropertiesInPortfolio
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Method Investment, Number Of Stores + References No definition available. + Details
Name: | exr_EquityMethodInvestmentNumberOfStores
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Method Investment, Ownership Percentage Exchanged + References No definition available. + Details
Name: | exr_EquityMethodInvestmentOwnershipPercentageExchanged
Namespace Prefix: | exr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Method Investments, Number of Joint Ventures + References No definition available. + Details
Name: | exr_EquityMethodInvestmentsNumberOfJointVentures
Namespace Prefix: | exr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment In Unconsolidated Real Estate Entities, Net Of Distributions + References No definition available. + Details
Name: | exr_InvestmentInUnconsolidatedRealEstateEntitiesNetOfDistributions
Namespace Prefix: | exr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Preferred Stock, Dividend Rate Increase, Threshold + References No definition available. + Details
Name: | exr_PreferredStockDividendRateIncreaseThreshold
Namespace Prefix: | exr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock Investment, Dividend Rate + References No definition available. + Details
Name: | exr_PreferredStockInvestmentDividendRate
Namespace Prefix: | exr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock, Redemption Period + References No definition available. + Details
Name: | exr_PreferredStockRedemptionPeriod
Namespace Prefix: | exr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of excess profit participation in unconsolidated joint ventures. + References No definition available. + Details
Name: | exr_UnconsolidatedJointVenturesExcessProfitParticipationPercentage
Namespace Prefix: | exr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
Name: | us-gaap_PaymentsToAcquireInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_PRISASelfStorageLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_HF1SovranHHFStorageHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StoragePortfolioIIJVLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StoragePortfolioIVJVLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StoragePortfolioILLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_ESSCATIVSJVLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_HF2SovranHHFStorageHoldingsIILLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_HF5LifeStorageHIERSStorageLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_HF6191VLifeStorageHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_PRIIEXRJVLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exr_PartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_VRSSelfStorageLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_HF10LifeStorageHHFWasatchHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_OtherMinorityOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StrategicStorageGrowthTrustIIIInc.PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StrategicStorageTrustVIIncPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_SmartStopSelfStorageREITIncSeriesAConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_ESSNYFLJVLPAndESSCATIVSJVLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=exr_StrategicStorageGrowthTrustIIIInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |