Summary of Reportable Segments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues:      
Total revenues $ 168,764,571 $ 124,024,363 $ 109,528,549
Operating expenses:      
General and administrative 23,265,196 16,471,199 10,461,453
Depreciation 40,946,406 32,294,627 29,605,278
Intangible amortization expense 12,422,205 9,777,116 11,493,394
Other property acquisition expenses 934,838 1,366,092 141,489
Contingent earnout adjustment 12,619,744 (2,500,000) 200,000
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control 8,389,573 0 0
Self administration transaction expenses   0 1,572,238
Acquisition expenses – affiliates     84,061
Impairment of goodwill and intangible assets   36,465,732  
Impairment of investments in Managed REITs 0 4,376,879 0
Total operating expenses 152,435,452 145,164,573 101,885,233
Gain on sale of real estate 178,631 0 3,944,696
Income (loss) from operations 16,507,750 (21,140,210) 11,588,012
Other income (expense):      
Interest expense (31,818,237) (32,597,613) (37,563,247)
Interest expense – accretion of fair market value of secured debt 110,942 130,682 131,611
Interest expense – debt issuance costs (1,676,309) (3,586,381) (3,996,676)
Loss on extinguishment of debt (2,444,788) 0 (2,647,633)
Gain resulting from acquisition of unconsolidated affiliates   0 8,017,353
Other (244,076) 5,986,719 (624,958)
Net loss (19,564,718) (51,206,803) (25,095,538)
Self Storage      
Revenues:      
Total revenues 158,162,934 110,174,925 103,201,260
Operating expenses:      
Depreciation 40,203,484 31,773,526 29,305,979
Intangible amortization expense 11,134,100 5,234,312 9,051,083
Other property acquisition expenses 934,838 1,366,092 141,489
Acquisition expenses – affiliates     84,061
Total operating expenses 100,400,079 76,679,129 80,911,393
Gain on sale of real estate 178,631   3,944,696
Income (loss) from operations 57,941,486 33,495,796 26,234,563
Other income (expense):      
Interest expense (31,641,943) (32,417,179) (37,469,725)
Interest expense – accretion of fair market value of secured debt 110,942 130,682 131,611
Interest expense – debt issuance costs (1,676,309) (3,577,730) (3,990,421)
Loss on extinguishment of debt (2,444,788)   (2,635,278)
Gain resulting from acquisition of unconsolidated affiliates     8,017,353
Other (366,849) 1,708,026 (1,159,570)
Net loss 21,922,539 (660,405) (10,871,467)
Managed REIT Platform      
Revenues:      
Total revenues 10,601,637 13,849,438 6,327,289
Operating expenses:      
Intangible amortization expense 1,288,105 4,542,804 2,442,311
Contingent earnout adjustment 12,619,744 (2,500,000)  
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control 8,389,573    
Impairment of goodwill and intangible assets   36,465,732  
Impairment of investments in Managed REITs   4,376,879  
Total operating expenses 28,027,255 51,493,144 8,440,850
Income (loss) from operations (17,425,618) (37,643,706) (2,113,561)
Other income (expense):      
Other 1,402,476 4,557,129 534,612
Net loss (16,023,142) (33,086,577) (1,578,949)
Corporate and Other      
Operating expenses:      
General and administrative 23,265,196 16,471,199 10,461,453
Depreciation 742,922 521,101 299,299
Contingent earnout adjustment     200,000
Self administration transaction expenses     1,572,238
Total operating expenses 24,008,118 16,992,300 12,532,990
Income (loss) from operations (24,008,118) (16,992,300) (12,532,990)
Other income (expense):      
Interest expense (176,294) (180,434) (93,522)
Interest expense – debt issuance costs   (8,651) (6,255)
Loss on extinguishment of debt     (12,355)
Other (1,279,703) (278,436)  
Net loss (25,464,115) (17,459,821) (12,645,122)
Self Storage Rental Revenue      
Revenues:      
Total revenues 150,610,337 104,888,883 99,494,560
Self Storage Rental Revenue | Self Storage      
Revenues:      
Total revenues 150,610,337 104,888,883 99,494,560
Ancillary Operating Revenue      
Revenues:      
Total revenues 7,552,597 5,286,042 3,706,700
Ancillary Operating Revenue | Self Storage      
Revenues:      
Total revenues 7,552,597 5,286,042 3,706,700
Managed REIT Platform Revenue      
Revenues:      
Total revenues 6,322,970 8,048,630 3,068,306
Managed REIT Platform Revenue | Managed REIT Platform      
Revenues:      
Total revenues 6,322,970 8,048,630 3,068,306
Reimbursable Costs from Managed REITs      
Revenues:      
Total revenues 4,278,667 5,800,808 3,258,983
Operating expenses:      
Operating expenses 4,278,667 5,800,808 3,258,983
Reimbursable Costs from Managed REITs | Managed REIT Platform      
Revenues:      
Total revenues 4,278,667 5,800,808 3,258,983
Operating expenses:      
Operating expenses 4,278,667 5,800,808 3,258,983
Property Operating Expenses      
Operating expenses:      
Operating expenses 48,127,657 38,305,199 35,723,111
Property Operating Expenses | Self Storage      
Operating expenses:      
Operating expenses 48,127,657 38,305,199 35,723,111
Property Operating Expenses – Affiliates      
Operating expenses:      
Operating expenses     6,605,670
Property Operating Expenses – Affiliates | Self Storage      
Operating expenses:      
Operating expenses     6,605,670
Managed REIT Platform Expenses      
Operating expenses:      
Operating expenses 1,451,166 2,806,921 2,739,556
Managed REIT Platform Expenses | Managed REIT Platform      
Operating expenses:      
Operating expenses $ 1,451,166 $ 2,806,921 $ 2,739,556