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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
ft²
storage_facility
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2,869
Net Rentable Square Feet | ft² 204,217
2022 Encum- brances $ 10,092
Initial Cost, Land 5,196,649
Initial Cost, Building & Improvements 14,907,072
Costs Subsequent to Acquisition 4,115,405
Gross Carrying Amount, Land 5,273,073
Gross Carrying Amount, Buildings 18,946,053
Gross Carrying Amount, Total 24,219,126
Accumulated Depreciation 8,554,155
Commercial and non-operating real estate  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
2022 Encum- brances 0
Initial Cost, Land 13,194
Initial Cost, Building & Improvements 26,143
Costs Subsequent to Acquisition 78,824
Gross Carrying Amount, Land 13,349
Gross Carrying Amount, Buildings 104,812
Gross Carrying Amount, Total 118,161
Accumulated Depreciation $ 53,952
Los Angeles | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 226
Net Rentable Square Feet | ft² 16,652
2022 Encum- brances $ 359
Initial Cost, Land 543,650
Initial Cost, Building & Improvements 981,256
Costs Subsequent to Acquisition 471,088
Gross Carrying Amount, Land 542,073
Gross Carrying Amount, Buildings 1,453,921
Gross Carrying Amount, Total 1,995,994
Accumulated Depreciation $ 928,465
Dallas/Ft. Worth | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 193
Net Rentable Square Feet | ft² 17,274
2022 Encum- brances $ 0
Initial Cost, Land 328,518
Initial Cost, Building & Improvements 1,889,830
Costs Subsequent to Acquisition 214,515
Gross Carrying Amount, Land 329,979
Gross Carrying Amount, Buildings 2,102,884
Gross Carrying Amount, Total 2,432,863
Accumulated Depreciation $ 421,762
Houston | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 145
Net Rentable Square Feet | ft² 12,265
2022 Encum- brances $ 0
Initial Cost, Land 239,385
Initial Cost, Building & Improvements 647,576
Costs Subsequent to Acquisition 258,080
Gross Carrying Amount, Land 238,706
Gross Carrying Amount, Buildings 906,335
Gross Carrying Amount, Total 1,145,041
Accumulated Depreciation $ 381,723
San Francisco | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 141
Net Rentable Square Feet | ft² 9,197
2022 Encum- brances $ 0
Initial Cost, Land 245,623
Initial Cost, Building & Improvements 557,398
Costs Subsequent to Acquisition 314,857
Gross Carrying Amount, Land 258,373
Gross Carrying Amount, Buildings 859,505
Gross Carrying Amount, Total 1,117,878
Accumulated Depreciation $ 557,875
Chicago | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 137
Net Rentable Square Feet | ft² 8,865
2022 Encum- brances $ 0
Initial Cost, Land 147,606
Initial Cost, Building & Improvements 440,494
Costs Subsequent to Acquisition 144,497
Gross Carrying Amount, Land 150,443
Gross Carrying Amount, Buildings 582,154
Gross Carrying Amount, Total 732,597
Accumulated Depreciation $ 427,557
Washington DC | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 118
Net Rentable Square Feet | ft² 8,341
2022 Encum- brances $ 0
Initial Cost, Land 420,884
Initial Cost, Building & Improvements 1,319,147
Costs Subsequent to Acquisition 199,354
Gross Carrying Amount, Land 436,704
Gross Carrying Amount, Buildings 1,502,681
Gross Carrying Amount, Total 1,939,385
Accumulated Depreciation $ 435,221
Atlanta | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 112
Net Rentable Square Feet | ft² 7,550
2022 Encum- brances $ 1,591
Initial Cost, Land 143,799
Initial Cost, Building & Improvements 420,664
Costs Subsequent to Acquisition 101,272
Gross Carrying Amount, Land 144,161
Gross Carrying Amount, Buildings 521,574
Gross Carrying Amount, Total 665,735
Accumulated Depreciation $ 319,016
Seattle/Tacoma | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 100
Net Rentable Square Feet | ft² 6,980
2022 Encum- brances $ 0
Initial Cost, Land 211,959
Initial Cost, Building & Improvements 584,089
Costs Subsequent to Acquisition 161,112
Gross Carrying Amount, Land 212,568
Gross Carrying Amount, Buildings 744,592
Gross Carrying Amount, Total 957,160
Accumulated Depreciation $ 410,728
Miami | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 99
Net Rentable Square Feet | ft² 7,460
2022 Encum- brances $ 0
Initial Cost, Land 252,244
Initial Cost, Building & Improvements 560,224
Costs Subsequent to Acquisition 172,704
Gross Carrying Amount, Land 254,137
Gross Carrying Amount, Buildings 731,035
Gross Carrying Amount, Total 985,172
Accumulated Depreciation $ 397,084
New York | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 98
Net Rentable Square Feet | ft² 7,278
2022 Encum- brances $ 0
Initial Cost, Land 281,499
Initial Cost, Building & Improvements 617,448
Costs Subsequent to Acquisition 268,202
Gross Carrying Amount, Land 287,836
Gross Carrying Amount, Buildings 879,313
Gross Carrying Amount, Total 1,167,149
Accumulated Depreciation $ 536,545
Orlando/Daytona | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 98
Net Rentable Square Feet | ft² 5,781
2022 Encum- brances $ 0
Initial Cost, Land 157,808
Initial Cost, Building & Improvements 408,287
Costs Subsequent to Acquisition 70,883
Gross Carrying Amount, Land 163,289
Gross Carrying Amount, Buildings 473,689
Gross Carrying Amount, Total 636,978
Accumulated Depreciation $ 191,858
Denver | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 70
Net Rentable Square Feet | ft² 5,291
2022 Encum- brances $ 8,142
Initial Cost, Land 120,117
Initial Cost, Building & Improvements 323,262
Costs Subsequent to Acquisition 106,286
Gross Carrying Amount, Land 120,838
Gross Carrying Amount, Buildings 428,827
Gross Carrying Amount, Total 549,665
Accumulated Depreciation $ 187,978
Minneapolis/St. Paul | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 65
Net Rentable Square Feet | ft² 5,218
2022 Encum- brances $ 0
Initial Cost, Land 123,460
Initial Cost, Building & Improvements 300,698
Costs Subsequent to Acquisition 126,906
Gross Carrying Amount, Land 127,014
Gross Carrying Amount, Buildings 424,050
Gross Carrying Amount, Total 551,064
Accumulated Depreciation $ 166,687
Philadelphia | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 62
Net Rentable Square Feet | ft² 4,041
2022 Encum- brances $ 0
Initial Cost, Land 58,824
Initial Cost, Building & Improvements 226,733
Costs Subsequent to Acquisition 85,150
Gross Carrying Amount, Land 57,845
Gross Carrying Amount, Buildings 312,862
Gross Carrying Amount, Total 370,707
Accumulated Depreciation $ 187,147
Charlotte | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 61
Net Rentable Square Feet | ft² 4,689
2022 Encum- brances $ 0
Initial Cost, Land 89,309
Initial Cost, Building & Improvements 238,236
Costs Subsequent to Acquisition 85,982
Gross Carrying Amount, Land 97,172
Gross Carrying Amount, Buildings 316,355
Gross Carrying Amount, Total 413,527
Accumulated Depreciation $ 158,819
Tampa | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 57
Net Rentable Square Feet | ft² 3,985
2022 Encum- brances $ 0
Initial Cost, Land 93,109
Initial Cost, Building & Improvements 213,546
Costs Subsequent to Acquisition 85,926
Gross Carrying Amount, Land 96,422
Gross Carrying Amount, Buildings 296,159
Gross Carrying Amount, Total 392,581
Accumulated Depreciation $ 155,070
Detroit | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 48
Net Rentable Square Feet | ft² 3,595
2022 Encum- brances $ 0
Initial Cost, Land 67,465
Initial Cost, Building & Improvements 225,061
Costs Subsequent to Acquisition 61,379
Gross Carrying Amount, Land 68,871
Gross Carrying Amount, Buildings 285,034
Gross Carrying Amount, Total 353,905
Accumulated Depreciation $ 142,253
Portland | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 49
Net Rentable Square Feet | ft² 2,865
2022 Encum- brances $ 0
Initial Cost, Land 60,975
Initial Cost, Building & Improvements 218,076
Costs Subsequent to Acquisition 51,935
Gross Carrying Amount, Land 61,633
Gross Carrying Amount, Buildings 269,353
Gross Carrying Amount, Total 330,986
Accumulated Depreciation $ 124,847
Baltimore | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 50
Net Rentable Square Feet | ft² 3,851
2022 Encum- brances $ 0
Initial Cost, Land 136,598
Initial Cost, Building & Improvements 775,086
Costs Subsequent to Acquisition 42,754
Gross Carrying Amount, Land 136,722
Gross Carrying Amount, Buildings 817,716
Gross Carrying Amount, Total 954,438
Accumulated Depreciation $ 131,757
Phoenix | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 50
Net Rentable Square Feet | ft² 3,499
2022 Encum- brances $ 0
Initial Cost, Land 99,453
Initial Cost, Building & Improvements 304,379
Costs Subsequent to Acquisition 45,259
Gross Carrying Amount, Land 99,444
Gross Carrying Amount, Buildings 349,647
Gross Carrying Amount, Total 449,091
Accumulated Depreciation $ 139,434
West Palm Beach | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 46
Net Rentable Square Feet | ft² 3,833
2022 Encum- brances $ 0
Initial Cost, Land 156,788
Initial Cost, Building & Improvements 221,479
Costs Subsequent to Acquisition 114,853
Gross Carrying Amount, Land 157,496
Gross Carrying Amount, Buildings 335,624
Gross Carrying Amount, Total 493,120
Accumulated Depreciation $ 161,302
San Antonio | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 40
Net Rentable Square Feet | ft² 2,827
2022 Encum- brances $ 0
Initial Cost, Land 54,753
Initial Cost, Building & Improvements 224,313
Costs Subsequent to Acquisition 31,712
Gross Carrying Amount, Land 54,711
Gross Carrying Amount, Buildings 256,067
Gross Carrying Amount, Total 310,778
Accumulated Depreciation $ 84,489
Austin | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 37
Net Rentable Square Feet | ft² 2,942
2022 Encum- brances $ 0
Initial Cost, Land 69,205
Initial Cost, Building & Improvements 188,500
Costs Subsequent to Acquisition 49,021
Gross Carrying Amount, Land 71,227
Gross Carrying Amount, Buildings 235,499
Gross Carrying Amount, Total 306,726
Accumulated Depreciation $ 109,453
Raleigh | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 38
Net Rentable Square Feet | ft² 2,732
2022 Encum- brances $ 0
Initial Cost, Land 89,212
Initial Cost, Building & Improvements 212,776
Costs Subsequent to Acquisition 42,985
Gross Carrying Amount, Land 90,201
Gross Carrying Amount, Buildings 254,772
Gross Carrying Amount, Total 344,973
Accumulated Depreciation $ 83,693
Norfolk | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 36
Net Rentable Square Feet | ft² 2,208
2022 Encum- brances $ 0
Initial Cost, Land 47,728
Initial Cost, Building & Improvements 128,986
Costs Subsequent to Acquisition 30,103
Gross Carrying Amount, Land 46,843
Gross Carrying Amount, Buildings 159,974
Gross Carrying Amount, Total 206,817
Accumulated Depreciation $ 84,167
Sacramento | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 35
Net Rentable Square Feet | ft² 2,054
2022 Encum- brances $ 0
Initial Cost, Land 26,429
Initial Cost, Building & Improvements 80,391
Costs Subsequent to Acquisition 42,815
Gross Carrying Amount, Land 26,913
Gross Carrying Amount, Buildings 122,722
Gross Carrying Amount, Total 149,635
Accumulated Depreciation $ 90,534
Indianapolis | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 31
Net Rentable Square Feet | ft² 2,040
2022 Encum- brances $ 0
Initial Cost, Land 40,905
Initial Cost, Building & Improvements 109,447
Costs Subsequent to Acquisition 24,061
Gross Carrying Amount, Land 41,905
Gross Carrying Amount, Buildings 132,508
Gross Carrying Amount, Total 174,413
Accumulated Depreciation $ 57,787
Kansas City | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 30
Net Rentable Square Feet | ft² 1,972
2022 Encum- brances $ 0
Initial Cost, Land 19,603
Initial Cost, Building & Improvements 106,102
Costs Subsequent to Acquisition 37,676
Gross Carrying Amount, Land 19,803
Gross Carrying Amount, Buildings 143,578
Gross Carrying Amount, Total 163,381
Accumulated Depreciation $ 70,531
Boston | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 28
Net Rentable Square Feet | ft² 1,962
2022 Encum- brances $ 0
Initial Cost, Land 80,843
Initial Cost, Building & Improvements 209,495
Costs Subsequent to Acquisition 39,655
Gross Carrying Amount, Land 81,409
Gross Carrying Amount, Buildings 248,584
Gross Carrying Amount, Total 329,993
Accumulated Depreciation $ 124,302
St. Louis | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 28
Net Rentable Square Feet | ft² 1,749
2022 Encum- brances $ 0
Initial Cost, Land 23,539
Initial Cost, Building & Improvements 89,341
Costs Subsequent to Acquisition 35,063
Gross Carrying Amount, Land 23,395
Gross Carrying Amount, Buildings 124,548
Gross Carrying Amount, Total 147,943
Accumulated Depreciation $ 72,260
Columbus | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 27
Net Rentable Square Feet | ft² 2,015
2022 Encum- brances $ 0
Initial Cost, Land 44,983
Initial Cost, Building & Improvements 92,001
Costs Subsequent to Acquisition 29,817
Gross Carrying Amount, Land 45,090
Gross Carrying Amount, Buildings 121,711
Gross Carrying Amount, Total 166,801
Accumulated Depreciation $ 57,187
Columbia | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 27
Net Rentable Square Feet | ft² 1,620
2022 Encum- brances $ 0
Initial Cost, Land 27,177
Initial Cost, Building & Improvements 83,532
Costs Subsequent to Acquisition 23,724
Gross Carrying Amount, Land 27,936
Gross Carrying Amount, Buildings 106,497
Gross Carrying Amount, Total 134,433
Accumulated Depreciation $ 47,839
Oklahoma City | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 36
Net Rentable Square Feet | ft² 2,695
2022 Encum- brances $ 0
Initial Cost, Land 58,426
Initial Cost, Building & Improvements 197,991
Costs Subsequent to Acquisition 19,338
Gross Carrying Amount, Land 58,426
Gross Carrying Amount, Buildings 217,329
Gross Carrying Amount, Total 275,755
Accumulated Depreciation $ 38,708
San Diego | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 24
Net Rentable Square Feet | ft² 2,183
2022 Encum- brances $ 0
Initial Cost, Land 89,782
Initial Cost, Building & Improvements 162,043
Costs Subsequent to Acquisition 52,943
Gross Carrying Amount, Land 92,292
Gross Carrying Amount, Buildings 212,476
Gross Carrying Amount, Total 304,768
Accumulated Depreciation $ 111,712
Las Vegas | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 25
Net Rentable Square Feet | ft² 1,649
2022 Encum- brances $ 0
Initial Cost, Land 28,016
Initial Cost, Building & Improvements 113,889
Costs Subsequent to Acquisition 22,270
Gross Carrying Amount, Land 27,264
Gross Carrying Amount, Buildings 136,911
Gross Carrying Amount, Total 164,175
Accumulated Depreciation $ 58,605
Cincinnati | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 21
Net Rentable Square Feet | ft² 1,241
2022 Encum- brances $ 0
Initial Cost, Land 19,385
Initial Cost, Building & Improvements 67,782
Costs Subsequent to Acquisition 24,688
Gross Carrying Amount, Land 19,303
Gross Carrying Amount, Buildings 92,552
Gross Carrying Amount, Total 111,855
Accumulated Depreciation $ 38,121
Nashville/Bowling Green | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 19
Net Rentable Square Feet | ft² 1,221
2022 Encum- brances $ 0
Initial Cost, Land 25,374
Initial Cost, Building & Improvements 57,494
Costs Subsequent to Acquisition 32,496
Gross Carrying Amount, Land 25,372
Gross Carrying Amount, Buildings 89,992
Gross Carrying Amount, Total 115,364
Accumulated Depreciation $ 37,098
Colorado Springs | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 16
Net Rentable Square Feet | ft² 1,118
2022 Encum- brances $ 0
Initial Cost, Land 12,320
Initial Cost, Building & Improvements 60,393
Costs Subsequent to Acquisition 23,467
Gross Carrying Amount, Land 12,317
Gross Carrying Amount, Buildings 83,863
Gross Carrying Amount, Total 96,180
Accumulated Depreciation $ 35,592
Milwaukee | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 964
2022 Encum- brances $ 0
Initial Cost, Land 13,189
Initial Cost, Building & Improvements 32,071
Costs Subsequent to Acquisition 10,806
Gross Carrying Amount, Land 13,158
Gross Carrying Amount, Buildings 42,908
Gross Carrying Amount, Total 56,066
Accumulated Depreciation $ 37,262
Louisville | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 913
2022 Encum- brances $ 0
Initial Cost, Land 23,563
Initial Cost, Building & Improvements 46,108
Costs Subsequent to Acquisition 8,936
Gross Carrying Amount, Land 23,562
Gross Carrying Amount, Buildings 55,045
Gross Carrying Amount, Total 78,607
Accumulated Depreciation $ 21,323
Jacksonville | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 922
2022 Encum- brances $ 0
Initial Cost, Land 14,454
Initial Cost, Building & Improvements 47,415
Costs Subsequent to Acquisition 13,294
Gross Carrying Amount, Land 14,503
Gross Carrying Amount, Buildings 60,660
Gross Carrying Amount, Total 75,163
Accumulated Depreciation $ 38,156
Birmingham | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 606
2022 Encum- brances $ 0
Initial Cost, Land 6,316
Initial Cost, Building & Improvements 25,567
Costs Subsequent to Acquisition 15,119
Gross Carrying Amount, Land 6,204
Gross Carrying Amount, Buildings 40,798
Gross Carrying Amount, Total 47,002
Accumulated Depreciation $ 30,303
Richmond | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 768
2022 Encum- brances $ 0
Initial Cost, Land 20,979
Initial Cost, Building & Improvements 52,239
Costs Subsequent to Acquisition 6,712
Gross Carrying Amount, Land 20,784
Gross Carrying Amount, Buildings 59,146
Gross Carrying Amount, Total 79,930
Accumulated Depreciation $ 24,763
Greensboro | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 14
Net Rentable Square Feet | ft² 845
2022 Encum- brances $ 0
Initial Cost, Land 13,413
Initial Cost, Building & Improvements 35,326
Costs Subsequent to Acquisition 15,088
Gross Carrying Amount, Land 15,502
Gross Carrying Amount, Buildings 48,325
Gross Carrying Amount, Total 63,827
Accumulated Depreciation $ 31,488
Charleston | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 14
Net Rentable Square Feet | ft² 978
2022 Encum- brances $ 0
Initial Cost, Land 16,947
Initial Cost, Building & Improvements 56,793
Costs Subsequent to Acquisition 23,215
Gross Carrying Amount, Land 17,923
Gross Carrying Amount, Buildings 79,032
Gross Carrying Amount, Total 96,955
Accumulated Depreciation $ 33,383
Fort Myers/Naples | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 1,148
2022 Encum- brances $ 0
Initial Cost, Land 32,185
Initial Cost, Building & Improvements 95,517
Costs Subsequent to Acquisition 8,105
Gross Carrying Amount, Land 32,420
Gross Carrying Amount, Buildings 103,387
Gross Carrying Amount, Total 135,807
Accumulated Depreciation $ 26,587
Chattanooga | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 13
Net Rentable Square Feet | ft² 846
2022 Encum- brances $ 0
Initial Cost, Land 10,030
Initial Cost, Building & Improvements 45,578
Costs Subsequent to Acquisition 8,613
Gross Carrying Amount, Land 9,832
Gross Carrying Amount, Buildings 54,389
Gross Carrying Amount, Total 64,221
Accumulated Depreciation $ 19,596
Savannah | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 12
Net Rentable Square Feet | ft² 700
2022 Encum- brances $ 0
Initial Cost, Land 33,094
Initial Cost, Building & Improvements 42,465
Costs Subsequent to Acquisition 5,698
Gross Carrying Amount, Land 31,766
Gross Carrying Amount, Buildings 49,491
Gross Carrying Amount, Total 81,257
Accumulated Depreciation $ 23,012
Greensville/Spartanburg/Asheville | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 14
Net Rentable Square Feet | ft² 842
2022 Encum- brances $ 0
Initial Cost, Land 10,815
Initial Cost, Building & Improvements 50,364
Costs Subsequent to Acquisition 11,111
Gross Carrying Amount, Land 11,744
Gross Carrying Amount, Buildings 60,546
Gross Carrying Amount, Total 72,290
Accumulated Depreciation $ 25,378
Honolulu | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 11
Net Rentable Square Feet | ft² 807
2022 Encum- brances $ 0
Initial Cost, Land 54,184
Initial Cost, Building & Improvements 106,299
Costs Subsequent to Acquisition 21,266
Gross Carrying Amount, Land 55,101
Gross Carrying Amount, Buildings 126,648
Gross Carrying Amount, Total 181,749
Accumulated Depreciation $ 78,924
Hartford/New Haven | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 11
Net Rentable Square Feet | ft² 693
2022 Encum- brances $ 0
Initial Cost, Land 6,778
Initial Cost, Building & Improvements 19,959
Costs Subsequent to Acquisition 22,898
Gross Carrying Amount, Land 8,443
Gross Carrying Amount, Buildings 41,192
Gross Carrying Amount, Total 49,635
Accumulated Depreciation $ 35,980
New Orleans | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 11
Net Rentable Square Feet | ft² 772
2022 Encum- brances $ 0
Initial Cost, Land 13,372
Initial Cost, Building & Improvements 59,382
Costs Subsequent to Acquisition 9,197
Gross Carrying Amount, Land 13,540
Gross Carrying Amount, Buildings 68,411
Gross Carrying Amount, Total 81,951
Accumulated Depreciation $ 31,527
Salt Lake City | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 12
Net Rentable Square Feet | ft² 758
2022 Encum- brances $ 0
Initial Cost, Land 18,606
Initial Cost, Building & Improvements 37,739
Costs Subsequent to Acquisition 6,242
Gross Carrying Amount, Land 18,255
Gross Carrying Amount, Buildings 44,332
Gross Carrying Amount, Total 62,587
Accumulated Depreciation $ 17,354
Memphis | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 11
Net Rentable Square Feet | ft² 645
2022 Encum- brances $ 0
Initial Cost, Land 19,581
Initial Cost, Building & Improvements 29,852
Costs Subsequent to Acquisition 11,269
Gross Carrying Amount, Land 20,934
Gross Carrying Amount, Buildings 39,768
Gross Carrying Amount, Total 60,702
Accumulated Depreciation $ 25,156
Mobile | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 15
Net Rentable Square Feet | ft² 759
2022 Encum- brances $ 0
Initial Cost, Land 18,688
Initial Cost, Building & Improvements 45,137
Costs Subsequent to Acquisition 6,859
Gross Carrying Amount, Land 18,515
Gross Carrying Amount, Buildings 52,169
Gross Carrying Amount, Total 70,684
Accumulated Depreciation $ 17,238
Omaha | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 11
Net Rentable Square Feet | ft² 940
2022 Encum- brances $ 0
Initial Cost, Land 17,965
Initial Cost, Building & Improvements 69,085
Costs Subsequent to Acquisition 4,785
Gross Carrying Amount, Land 17,965
Gross Carrying Amount, Buildings 73,870
Gross Carrying Amount, Total 91,835
Accumulated Depreciation $ 10,254
Buffalo/Rochester | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 9
Net Rentable Square Feet | ft² 462
2022 Encum- brances $ 0
Initial Cost, Land 6,785
Initial Cost, Building & Improvements 17,954
Costs Subsequent to Acquisition 4,328
Gross Carrying Amount, Land 6,783
Gross Carrying Amount, Buildings 22,284
Gross Carrying Amount, Total 29,067
Accumulated Depreciation $ 16,267
Cleveland/Akron | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 10
Net Rentable Square Feet | ft² 631
2022 Encum- brances $ 0
Initial Cost, Land 5,916
Initial Cost, Building & Improvements 30,775
Costs Subsequent to Acquisition 6,213
Gross Carrying Amount, Land 6,309
Gross Carrying Amount, Buildings 36,595
Gross Carrying Amount, Total 42,904
Accumulated Depreciation $ 14,890
Augusta | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 9
Net Rentable Square Feet | ft² 503
2022 Encum- brances $ 0
Initial Cost, Land 9,397
Initial Cost, Building & Improvements 24,669
Costs Subsequent to Acquisition 4,817
Gross Carrying Amount, Land 9,397
Gross Carrying Amount, Buildings 29,486
Gross Carrying Amount, Total 38,883
Accumulated Depreciation $ 9,188
Reno | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 7
Net Rentable Square Feet | ft² 559
2022 Encum- brances $ 0
Initial Cost, Land 5,487
Initial Cost, Building & Improvements 18,704
Costs Subsequent to Acquisition 5,353
Gross Carrying Amount, Land 5,487
Gross Carrying Amount, Buildings 24,057
Gross Carrying Amount, Total 29,544
Accumulated Depreciation $ 14,450
Tucson | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 7
Net Rentable Square Feet | ft² 439
2022 Encum- brances $ 0
Initial Cost, Land 9,403
Initial Cost, Building & Improvements 25,491
Costs Subsequent to Acquisition 8,779
Gross Carrying Amount, Land 9,884
Gross Carrying Amount, Buildings 33,789
Gross Carrying Amount, Total 43,673
Accumulated Depreciation $ 23,192
Wichita | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 7
Net Rentable Square Feet | ft² 433
2022 Encum- brances $ 0
Initial Cost, Land 2,017
Initial Cost, Building & Improvements 6,691
Costs Subsequent to Acquisition 7,767
Gross Carrying Amount, Land 2,130
Gross Carrying Amount, Buildings 14,345
Gross Carrying Amount, Total 16,475
Accumulated Depreciation $ 12,642
Monterey/Salinas | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 7
Net Rentable Square Feet | ft² 329
2022 Encum- brances $ 0
Initial Cost, Land 8,465
Initial Cost, Building & Improvements 24,151
Costs Subsequent to Acquisition 7,729
Gross Carrying Amount, Land 8,455
Gross Carrying Amount, Buildings 31,890
Gross Carrying Amount, Total 40,345
Accumulated Depreciation $ 24,998
Boise | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 6
Net Rentable Square Feet | ft² 545
2022 Encum- brances $ 0
Initial Cost, Land 13,412
Initial Cost, Building & Improvements 55,496
Costs Subsequent to Acquisition 1,211
Gross Carrying Amount, Land 13,412
Gross Carrying Amount, Buildings 56,707
Gross Carrying Amount, Total 70,119
Accumulated Depreciation $ 3,802
Evansville | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 5
Net Rentable Square Feet | ft² 326
2022 Encum- brances $ 0
Initial Cost, Land 2,340
Initial Cost, Building & Improvements 14,316
Costs Subsequent to Acquisition 1,567
Gross Carrying Amount, Land 2,312
Gross Carrying Amount, Buildings 15,911
Gross Carrying Amount, Total 18,223
Accumulated Depreciation $ 5,593
Dayton | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 5
Net Rentable Square Feet | ft² 284
2022 Encum- brances $ 0
Initial Cost, Land 1,074
Initial Cost, Building & Improvements 8,975
Costs Subsequent to Acquisition 4,981
Gross Carrying Amount, Land 1,073
Gross Carrying Amount, Buildings 13,957
Gross Carrying Amount, Total 15,030
Accumulated Depreciation $ 8,290
Huntsville/Decatur | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 5
Net Rentable Square Feet | ft² 298
2022 Encum- brances $ 0
Initial Cost, Land 9,161
Initial Cost, Building & Improvements 13,481
Costs Subsequent to Acquisition 3,561
Gross Carrying Amount, Land 9,108
Gross Carrying Amount, Buildings 17,095
Gross Carrying Amount, Total 26,203
Accumulated Depreciation $ 7,163
Fort Wayne | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 4
Net Rentable Square Feet | ft² 271
2022 Encum- brances $ 0
Initial Cost, Land 3,487
Initial Cost, Building & Improvements 11,003
Costs Subsequent to Acquisition 3,610
Gross Carrying Amount, Land 3,487
Gross Carrying Amount, Buildings 14,613
Gross Carrying Amount, Total 18,100
Accumulated Depreciation $ 6,611
Roanoke | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 4
Net Rentable Square Feet | ft² 223
2022 Encum- brances $ 0
Initial Cost, Land 5,093
Initial Cost, Building & Improvements 18,091
Costs Subsequent to Acquisition 1,080
Gross Carrying Amount, Land 5,093
Gross Carrying Amount, Buildings 19,171
Gross Carrying Amount, Total 24,264
Accumulated Depreciation $ 4,645
Palm Springs | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 3
Net Rentable Square Feet | ft² 242
2022 Encum- brances $ 0
Initial Cost, Land 8,309
Initial Cost, Building & Improvements 18,065
Costs Subsequent to Acquisition 2,979
Gross Carrying Amount, Land 8,309
Gross Carrying Amount, Buildings 21,044
Gross Carrying Amount, Total 29,353
Accumulated Depreciation $ 13,108
Providence | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 3
Net Rentable Square Feet | ft² 155
2022 Encum- brances $ 0
Initial Cost, Land 995
Initial Cost, Building & Improvements 11,206
Costs Subsequent to Acquisition 3,191
Gross Carrying Amount, Land 995
Gross Carrying Amount, Buildings 14,397
Gross Carrying Amount, Total 15,392
Accumulated Depreciation $ 7,928
Shreveport | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 150
2022 Encum- brances $ 0
Initial Cost, Land 817
Initial Cost, Building & Improvements 3,030
Costs Subsequent to Acquisition 3,056
Gross Carrying Amount, Land 741
Gross Carrying Amount, Buildings 6,162
Gross Carrying Amount, Total 6,903
Accumulated Depreciation $ 5,088
Springfield/Holyoke | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 144
2022 Encum- brances $ 0
Initial Cost, Land 1,428
Initial Cost, Building & Improvements 3,380
Costs Subsequent to Acquisition 1,999
Gross Carrying Amount, Land 1,427
Gross Carrying Amount, Buildings 5,380
Gross Carrying Amount, Total 6,807
Accumulated Depreciation $ 5,243
Rochester | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 99
2022 Encum- brances $ 0
Initial Cost, Land 1,047
Initial Cost, Building & Improvements 2,246
Costs Subsequent to Acquisition 2,483
Gross Carrying Amount, Land 980
Gross Carrying Amount, Buildings 4,796
Gross Carrying Amount, Total 5,776
Accumulated Depreciation $ 4,354
Santa Barbara | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 98
2022 Encum- brances $ 0
Initial Cost, Land 5,733
Initial Cost, Building & Improvements 9,106
Costs Subsequent to Acquisition 1,133
Gross Carrying Amount, Land 5,733
Gross Carrying Amount, Buildings 10,239
Gross Carrying Amount, Total 15,972
Accumulated Depreciation $ 6,674
Topeka | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 94
2022 Encum- brances $ 0
Initial Cost, Land 225
Initial Cost, Building & Improvements 1,419
Costs Subsequent to Acquisition 2,136
Gross Carrying Amount, Land 225
Gross Carrying Amount, Buildings 3,555
Gross Carrying Amount, Total 3,780
Accumulated Depreciation $ 3,279
Lansing | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 2
Net Rentable Square Feet | ft² 88
2022 Encum- brances $ 0
Initial Cost, Land 556
Initial Cost, Building & Improvements 2,882
Costs Subsequent to Acquisition 996
Gross Carrying Amount, Land 556
Gross Carrying Amount, Buildings 3,878
Gross Carrying Amount, Total 4,434
Accumulated Depreciation $ 2,791
Flint | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 1
Net Rentable Square Feet | ft² 56
2022 Encum- brances $ 0
Initial Cost, Land 543
Initial Cost, Building & Improvements 3,068
Costs Subsequent to Acquisition 275
Gross Carrying Amount, Land 542
Gross Carrying Amount, Buildings 3,344
Gross Carrying Amount, Total 3,886
Accumulated Depreciation $ 2,252
Joplin | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 1
Net Rentable Square Feet | ft² 56
2022 Encum- brances $ 0
Initial Cost, Land 264
Initial Cost, Building & Improvements 904
Costs Subsequent to Acquisition 1,046
Gross Carrying Amount, Land 264
Gross Carrying Amount, Buildings 1,950
Gross Carrying Amount, Total 2,214
Accumulated Depreciation $ 1,708
Syracuse | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 1
Net Rentable Square Feet | ft² 55
2022 Encum- brances $ 0
Initial Cost, Land 545
Initial Cost, Building & Improvements 1,279
Costs Subsequent to Acquisition 906
Gross Carrying Amount, Land 545
Gross Carrying Amount, Buildings 2,185
Gross Carrying Amount, Total 2,730
Accumulated Depreciation $ 2,097
Modesto/Fresno/Stockton | Self-storage facilities  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
No. of Facilities | storage_facility 1
Net Rentable Square Feet | ft² 33
2022 Encum- brances $ 0
Initial Cost, Land 44
Initial Cost, Building & Improvements 206
Costs Subsequent to Acquisition 1,344
Gross Carrying Amount, Land 193
Gross Carrying Amount, Buildings 1,401
Gross Carrying Amount, Total 1,594
Accumulated Depreciation $ 1,060
Minimum  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
Estimated useful lives of buildings and improvements (in years) 5 years
Maximum  
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]  
Estimated useful lives of buildings and improvements (in years) 25 years