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Segment Disclosures - Summary of Reportable Segments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues:      
Total revenues $ 212,643,094 $ 168,764,571 $ 124,024,363
Operating expenses:      
General and administrative 28,253,905 23,265,196 16,471,199
Depreciation 49,417,679 40,946,406 32,294,627
Intangible amortization expense 15,200,854 12,422,205 9,777,116
Acquisition expenses 888,009 934,838 1,366,092
Contingent earnout adjustment 1,514,447 12,619,744 (2,500,000)
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control 2,049,682 8,389,573  
Impairment of goodwill and intangible assets     36,465,732
Impairment of investments in Managed REITs 0 0 4,376,879
Total operating expenses 162,875,473 152,435,452 145,164,573
Gain on sale of real estate 0 178,631 0
Gain resulting from acquisition of unconsolidated affiliates 16,101,237    
Income (loss) from operations 65,868,858 16,507,750 (21,140,210)
Other income (expense):      
Interest expense (41,511,911) (33,383,604) (36,053,312)
Loss on extinguishment of debt (2,393,475) (2,444,788) 0
Other, net (848,805) (2,055,351) 160,461
Income tax (expense) benefit 554,785 1,811,275 5,826,258
Net income (loss) 21,669,452 (19,564,718) (51,206,803)
Self Storage      
Revenues:      
Total revenues 200,195,381 158,162,934 110,174,925
Operating expenses:      
Depreciation 48,503,743 40,203,484 31,773,526
Intangible amortization expense 14,728,148 11,134,100 5,234,312
Acquisition expenses 888,009 934,838 1,366,092
Total operating expenses 122,557,010 100,400,079 76,679,129
Gain on sale of real estate   178,631  
Income (loss) from operations 77,638,371 57,941,486 33,495,796
Other income (expense):      
Interest expense (41,339,401) (33,207,310) (35,864,227)
Loss on extinguishment of debt (2,393,475) (2,444,788)  
Other, net (209,578) (173,245) (783,189)
Income tax (expense) benefit 36,197 (193,604) 2,491,215
Net income (loss) 33,732,114 21,922,539 (660,405)
Managed REIT Platform      
Revenues:      
Total revenues 12,447,713 10,601,637 13,849,438
Operating expenses:      
Intangible amortization expense 472,706 1,288,105 4,542,804
Contingent earnout adjustment 1,514,447 12,619,744 (2,500,000)
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control 2,049,682 8,389,573  
Impairment of goodwill and intangible assets     36,465,732
Impairment of investments in Managed REITs     4,376,879
Total operating expenses 11,150,622 28,027,255 51,493,144
Gain resulting from acquisition of unconsolidated affiliates 16,101,237    
Income (loss) from operations 17,398,328 (17,425,618) (37,643,706)
Other income (expense):      
Other, net 155,332 (602,403) 1,222,086
Income tax (expense) benefit 563,053 2,004,879 3,335,043
Net income (loss) 18,116,713 (16,023,142) (33,086,577)
Corporate and Other      
Operating expenses:      
General and administrative 28,253,905 23,265,196 16,471,199
Depreciation 913,936 742,922 521,101
Total operating expenses 29,167,841 24,008,118 16,992,300
Income (loss) from operations (29,167,841) (24,008,118) (16,992,300)
Other income (expense):      
Interest expense (172,510) (176,294) (189,085)
Other, net (794,559) (1,279,703) (278,436)
Income tax (expense) benefit (44,465)    
Net income (loss) (30,179,375) (25,464,115) (17,459,821)
Self Storage Rental Revenue      
Revenues:      
Total revenues 191,749,578 150,610,337 104,888,883
Self Storage Rental Revenue | Self Storage      
Revenues:      
Total revenues 191,749,578 150,610,337 104,888,883
Ancillary Operating Revenue      
Revenues:      
Total revenues 8,445,803 7,552,597 5,286,042
Ancillary Operating Revenue | Self Storage      
Revenues:      
Total revenues 8,445,803 7,552,597 5,286,042
Managed REIT Platform Revenue      
Revenues:      
Total revenues 7,819,216 6,322,970 8,048,630
Managed REIT Platform Revenue | Managed REIT Platform      
Revenues:      
Total revenues 7,819,216 6,322,970 8,048,630
Reimbursable Costs from Managed REITs      
Revenues:      
Total revenues 4,628,497 4,278,667 5,800,808
Operating expenses:      
Operating expenses 4,628,497 4,278,667 5,800,808
Reimbursable Costs from Managed REITs | Managed REIT Platform      
Revenues:      
Total revenues 4,628,497 4,278,667 5,800,808
Operating expenses:      
Operating expenses 4,628,497 4,278,667 5,800,808
Property Operating Expenses      
Operating expenses:      
Operating expenses 58,437,110 48,127,657 38,305,199
Property Operating Expenses | Self Storage      
Operating expenses:      
Operating expenses 58,437,110 48,127,657 38,305,199
Managed REIT Platform Expenses      
Operating expenses:      
Operating expenses 2,485,290 1,451,166 2,806,921
Managed REIT Platform Expenses | Managed REIT Platform      
Operating expenses:      
Operating expenses $ 2,485,290 $ 1,451,166 $ 2,806,921