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Segment Disclosures - Summary of Reportable Segments (Detail) - USD ($)
 12 Months Ended
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)