Summary of Reportable Segments (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Total revenues									$ 124,024,363	$ 109,528,549	$ 80,412,257
Operating expenses:
General and administrative									16,471,199	10,461,453	4,848,447
Depreciation									32,294,627	29,605,278	20,379,694
Intangible amortization expense									9,777,116	11,493,394	2,422,997
Other property acquisition expenses									1,366,092	141,489
Contingent earnout adjustment									(2,500,000)	200,000	0
Self administration transaction expenses									0	1,572,238	0
Acquisition expenses – affiliates										84,061
Impairment of goodwill and intangible assets									36,465,732
Impairment of investments in Managed REITs									4,376,879	0	0
Total operating expenses	$ 29,307,135	$ 26,992,137	$ 27,497,027	$ 61,368,274	$ 26,965,933	$ 27,773,486	$ 25,211,611	$ 21,934,203	145,164,573	101,885,233	64,260,814
Gain on sale of real estate									0	3,944,696	0
Operating income (loss)	3,586,438	4,370,985	1,972,518	(31,070,151)	7,055,456	1,814,528	768,906	1,949,122	(21,140,210)	11,588,012	16,151,443
Other income (expense):
Interest expense									(32,597,613)	(37,563,247)	(18,002,274)
Interest expense – accretion of fair market value of secured debt									130,682	131,611	413,353
Interest expense – debt issuance costs									(3,586,381)	(3,996,676)	(1,582,049)
Net loss on extinguishment of debt									0	(2,647,633)	0
Gain resulting from acquisition of unconsolidated affiliates									0	8,017,353	0
Other									5,986,719	(624,958)	(701,203)
Net loss	$ (1,943,884)	$ (4,456,497)	$ (7,062,841)	$ (37,743,581)	$ (4,321,670)	$ (9,541,579)	$ (2,283,972)	$ (8,948,317)	(51,206,803)	(25,095,538)	(3,720,730)
Self Storage
Revenues:
Total revenues									110,174,925	103,201,260
Operating expenses:
Depreciation									31,773,526	29,305,979
Intangible amortization expense									5,234,312	9,051,083
Other property acquisition expenses									1,366,092	141,489
Acquisition expenses – affiliates										84,061
Total operating expenses									76,679,129	80,911,393
Gain on sale of real estate										3,944,696
Operating income (loss)									33,495,796	26,234,563
Other income (expense):
Interest expense									(32,417,179)	(37,469,725)
Interest expense – accretion of fair market value of secured debt									130,682	131,611
Interest expense – debt issuance costs									(3,577,730)	(3,990,421)
Net loss on extinguishment of debt										(2,635,278)
Gain resulting from acquisition of unconsolidated affiliates										8,017,353
Other									1,708,026	(1,159,570)
Net loss									(660,405)	(10,871,467)
Managed REIT Platform
Revenues:
Total revenues									13,849,438	6,327,289
Operating expenses:
Intangible amortization expense									4,542,804	2,442,311
Contingent earnout adjustment									(2,500,000)
Impairment of goodwill and intangible assets									36,465,732
Impairment of investments in Managed REITs									4,376,879
Total operating expenses									51,493,144	8,440,850
Operating income (loss)									(37,643,706)	(2,113,561)
Other income (expense):
Other									4,557,129	534,612
Net loss									(33,086,577)	(1,578,949)
Corporate and Other
Operating expenses:
General and administrative									16,471,199	10,461,453
Depreciation									521,101	299,299
Contingent earnout adjustment										200,000
Self administration transaction expenses										1,572,238
Total operating expenses									16,992,300	12,532,990
Operating income (loss)									(16,992,300)	(12,532,990)
Other income (expense):
Interest expense									(180,434)	(93,522)
Interest expense – debt issuance costs									(8,651)	(6,255)
Net loss on extinguishment of debt										(12,355)
Other									(278,436)
Net loss									(17,459,821)	(12,645,122)
Self Storage Rental Revenue
Revenues:
Total revenues									104,888,883	99,494,560	78,473,091
Self Storage Rental Revenue | Self Storage
Revenues:
Total revenues									104,888,883	99,494,560
Ancillary Operating Revenue
Revenues:
Total revenues									5,286,042	3,706,700	1,939,166
Ancillary Operating Revenue | Self Storage
Revenues:
Total revenues									5,286,042	3,706,700
Managed REIT Platform Revenue
Revenues:
Total revenues									8,048,630	3,068,306	0
Managed REIT Platform Revenue | Managed REIT Platform
Revenues:
Total revenues									8,048,630	3,068,306
Reimbursable Costs from Managed REITs
Revenues:
Total revenues									5,800,808	3,258,983	0
Operating expenses:
Operating expenses									5,800,808	3,258,983	0
Reimbursable Costs from Managed REITs | Managed REIT Platform
Revenues:
Total revenues									5,800,808	3,258,983
Operating expenses:
Operating expenses									5,800,808	3,258,983
Property Operating Expenses
Operating expenses:
Operating expenses									38,305,199	35,723,111	25,228,704
Property Operating Expenses | Self Storage
Operating expenses:
Operating expenses									38,305,199	35,723,111
Property Operating Expenses – Affiliates
Operating expenses:
Operating expenses									0	6,605,670	10,254,634
Property Operating Expenses – Affiliates | Self Storage
Operating expenses:
Operating expenses										6,605,670
Managed REIT Platform Expenses
Operating expenses:
Operating expenses									2,806,921	2,739,556	$ 0
Managed REIT Platform Expenses | Managed REIT Platform
Operating expenses:
Operating expenses									$ 2,806,921	$ 2,739,556