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Segment Disclosures - Summary of Reportable Segments (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |
Total revenues | $ 237,006,000 | $ 232,992,000 | $ 212,643,000
Operating expenses: |  |  |
Segment operating income | 155,693,000 | 158,500,000 | 147,093,000
General and administrative | 29,948,000 | 27,452,000 | 28,254,000
Depreciation | 55,175,000 | 53,636,000 | 49,418,000
Intangible amortization expense | 935,000 | 6,594,000 | 15,201,000
Acquisition expenses | 413,000 | 193,000 | 888,000
Contingent earnout adjustment | 0 | 0 | 1,514,000
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control | 0 | 0 | 2,050,000
Total other operating expenses | 86,471,000 | 87,875,000 | 97,325,000
Gain on equity interests upon acquisition | 0 | 0 | 16,101,000
Income from operations | 69,222,000 | 70,625,000 | 65,869,000
Other income (expense): |  |  |
Other, net | (1,282,000) | (231,000) | (998,000)
Interest income | 3,247,000 | 3,360,000 | 1,838,000
Interest expense | (72,325,000) | (61,805,000) | (41,512,000)
Loss on debt extinguishment | (471,000) | 0 | (2,393,000)
Income tax (expense) benefit | (1,484,000) | 2,596,000 | 555,000
Net income (loss) | (5,887,000) | 11,647,000 | 21,669,000
Self Storage |  |  |
Revenues: |  |  |
Total revenues | 218,976,000 | 215,321,000 | 200,196,000
Operating expenses: |  |  |
Segment operating income | 148,292,000 | 149,958,000 | 141,759,000
Depreciation | 54,218,000 | 52,754,000 | 48,504,000
Intangible amortization expense | 810,000 | 6,398,000 | 14,728,000
Acquisition expenses | 413,000 | 193,000 | 888,000
Total other operating expenses | 55,441,000 | 59,345,000 | 64,120,000
Gain on equity interests upon acquisition |  |  | 0
Income from operations | 92,851,000 | 90,613,000 | 77,639,000
Other income (expense): |  |  |
Other, net | (1,204,000) | (149,000) | (220,000)
Interest income | 942,000 | 367,000 | 10,000
Interest expense | (71,868,000) | (61,636,000) | (41,339,000)
Loss on debt extinguishment | (471,000) |  | (2,393,000)
Income tax (expense) benefit | (1,175,000) | 2,401,000 | 36,000
Net income (loss) | 19,075,000 | 31,596,000 | 33,733,000
Managed REIT Platform |  |  |
Revenues: |  |  |
Total revenues | 18,030,000 | 17,671,000 | 12,447,000
Operating expenses: |  |  |
Segment operating income | 7,401,000 | 8,542,000 | 5,334,000
Intangible amortization expense | 125,000 | 196,000 | 473,000
Contingent earnout adjustment |  |  | 1,514,000
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control |  |  | 2,050,000
Total other operating expenses | 125,000 | 196,000 | 4,037,000
Gain on equity interests upon acquisition |  |  | 16,101,000
Income from operations | 7,276,000 | 8,346,000 | 17,398,000
Other income (expense): |  |  |
Other, net |  | 367,000 | (681,000)
Interest income | 2,305,000 | 2,993,000 | 1,767,000
Interest expense | (292,000) |  |
Income tax (expense) benefit | (265,000) | (197,000) | 563,000
Net income (loss) | 7,610,000 | 10,236,000 | 18,117,000
Corporate and Other |  |  |
Operating expenses: |  |  |
General and administrative | 29,948,000 | 27,452,000 | 28,254,000
Depreciation | 957,000 | 882,000 | 914,000
Total other operating expenses | 30,905,000 | 28,334,000 | 29,168,000
Income from operations | (30,905,000) | (28,334,000) | (29,168,000)
Other income (expense): |  |  |
Other, net | (78,000) | (449,000) | (97,000)
Interest income | 0 | 0 | 61,000
Interest expense | (165,000) | (169,000) | (173,000)
Income tax (expense) benefit | (44,000) | 392,000 | (44,000)
Net income (loss) | (32,572,000) | (30,185,000) | (30,181,000)
J V Properties |  |  |
Other income (expense): |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures | (1,380,000) | (1,625,000) | (760,000)
J V Properties | Corporate and Other |  |  |
Other income (expense): |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures | (1,380,000) | (1,625,000) | (760,000)
Self Storage Rental Revenue |  |  |
Revenues: |  |  |
Total revenues | 209,579,000 | 206,494,000 | 191,750,000
Self Storage Rental Revenue | Self Storage |  |  |
Revenues: |  |  |
Total revenues | 209,579,000 | 206,494,000 | 191,750,000
Ancillary Operating Revenue |  |  |
Revenues: |  |  |
Total revenues | 9,397,000 | 8,827,000 | 8,446,000
Ancillary Operating Revenue | Self Storage |  |  |
Revenues: |  |  |
Total revenues | 9,397,000 | 8,827,000 | 8,446,000
Managed REIT Platform Revenue |  |  |
Revenues: |  |  |
Total revenues | 11,383,000 | 11,906,000 | 7,819,000
Managed REIT Platform Revenue | Managed REIT Platform |  |  |
Revenues: |  |  |
Total revenues | 11,383,000 | 11,906,000 | 7,819,000
Reimbursable Costs from Managed REITs |  |  |
Revenues: |  |  |
Total revenues | 6,647,000 | 5,765,000 | 4,628,000
Operating expenses: |  |  |
Operating expenses | 6,647,000 | 5,764,000 | 4,628,000
Reimbursable Costs from Managed REITs | Managed REIT Platform |  |  |
Revenues: |  |  |
Total revenues | 6,647,000 | 5,765,000 | 4,628,000
Operating expenses: |  |  |
Operating expenses | 6,647,000 | 5,764,000 | 4,628,000
Property Operating Expenses |  |  |
Operating expenses: |  |  |
Property taxes | 21,070,000 | 19,940,000 | 17,627,000
Payroll | 16,731,000 | 15,775,000 | 13,997,000
Advertising | 5,664,000 | 5,145,000 | 4,755,000
Repairs & Maintenance | 5,483 | 4,749,000 | 4,658,000
Utilities | 5,090,000 | 5,070,000 | 4,922,000
Property Insurance | 5,407,000 | 4,297,000 | 3,020,000
Administrative and professional | 11,239,000 | 10,387,000 | 9,458,000
Operating expenses | 70,684,000 | 65,363,000 | 58,437,000
Property Operating Expenses | Self Storage |  |  |
Operating expenses: |  |  |
Property taxes | 21,070,000 | 19,940,000 | 17,627,000
Payroll | 16,731,000 | 15,775,000 | 13,997,000
Advertising | 5,664,000 | 5,145,000 | 4,755,000
Repairs & Maintenance | 5,483 | 4,749,000 | 4,658,000
Utilities | 5,090,000 | 5,070,000 | 4,922,000
Property Insurance | 5,407,000 | 4,297,000 | 3,020,000
Administrative and professional | 11,239,000 | 10,387,000 | 9,458,000
Operating expenses | 70,684,000 | 65,363,000 | 58,437,000
Managed REIT Platform Expenses |  |  |
Operating expenses: |  |  |
Operating expenses | 3,982,000 | 3,365,000 | 2,485,000
Managed REIT Platform Expenses | Managed REIT Platform |  |  |
Operating expenses: |  |  |
Operating expenses | 3,982,000 | 3,365,000 | 2,485,000
Managed REITS |  |  |
Other income (expense): |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures | (1,414,000) | (1,273,000) | (930,000)
Managed REITS | Managed REIT Platform |  |  |
Other income (expense): |  |  |
Equity in earnings (loss) of unconsolidated real estate ventures | $ (1,414,000) | $ (1,273,000) | $ (930,000)

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