Consolidated Statement of Equity - USD ($)	Total	Common Stock Class A [Member]	Common Stock Class T [Member]	Common Stock Class W [Member]	Class Y Common Stock [Member]	Class Z Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions [Member]	Accumulated Deficit [Member]	Strategic Student & Senior Housing Trust, Inc. [Member]	Noncontrolling Interests in our Operating Partnership [Member]	Preferred Equity in our Operating Partnership [Member]	Redeemable Common Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 60,255,483	$ 8,948					$ 68,799,264	$ (1,379,950)	$ (6,233,945)	$ 61,194,317	$ (938,834)		$ 303,844
Beginning Balance, shares at Dec. 31, 2017		8,948,551
Gross proceeds from issuance of common stock	15,740,030	$ 1,734					15,738,296			15,740,030
Gross proceeds from issuance of common stock, shares		1,733,591
Offering costs	(1,395,269)						(1,395,269)			(1,395,269)
Changes to redeemable common stock	(531,268)						(531,268)			(531,268)			531,268
Distributions	(1,482,380)							(1,482,380)		(1,482,380)
Distributions to noncontrolling interests	(3,907)										(3,907)
Issuance of shares for distribution reinvestment plan	531,268	$ 61					531,207			531,268
Issuance of shares for distribution reinvestment plan (in shares)		60,516
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(2,726,345)								(2,726,345)	(2,726,345)
Net loss attributable to the noncontrolling interests	(7,275)										(7,275)
Ending Balance at Mar. 31, 2018	70,380,337	$ 10,743					83,142,230	(2,862,330)	(8,960,290)	71,330,353	(950,016)		835,112
Ending Balance, shares at Mar. 31, 2018		10,742,658
Beginning Balance at Dec. 31, 2017	60,255,483	$ 8,948					68,799,264	(1,379,950)	(6,233,945)	61,194,317	(938,834)		303,844
Beginning Balance, shares at Dec. 31, 2017		8,948,551
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(11,333,814)
Net loss attributable to the noncontrolling interests	(27,372)
Ending Balance at Sep. 30, 2018	58,763,583	$ 10,987		$ 27			83,545,978	(6,247,595)	(17,567,759)	59,741,638	(978,055)	$ 6,309,097	2,087,530
Ending Balance, shares at Sep. 30, 2018		10,987,493		26,809
Beginning Balance at Mar. 31, 2018	70,380,337	$ 10,743					83,142,230	(2,862,330)	(8,960,290)	71,330,353	(950,016)		835,112
Beginning Balance, shares at Mar. 31, 2018		10,742,658
Gross proceeds from issuance of common stock	499,548	$ 54					499,494			499,548
Gross proceeds from issuance of common stock, shares		54,006
Offering costs	(97,580)						(97,580)			(97,580)
Changes to redeemable common stock	(635,442)						(635,442)			(635,442)			635,442
Distributions	(1,674,630)							(1,674,630)		(1,674,630)
Distributions to noncontrolling interests	(3,949)										(3,949)
Distributions to preferred unitholders in our Operating Partnership												(3,669)
Issuance of shares for distribution reinvestment plan	635,442	$ 69					635,373			635,442
Issuance of shares for distribution reinvestment plan (in shares)		69,595
Issuance of restricted stock	8	$ 8								8
Issuance of restricted stock (in shares)		7,500
Stock based compensation expense	968						968			968
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(4,081,095)								(4,081,095)	(4,081,095)		3,669
Net loss attributable to the noncontrolling interests	(9,687)										(9,687)
Issuance of preferred equity in our Operating Partnership												610,000
Accretion of non-cash preferred equity issuance costs												637
Ending Balance at Jun. 30, 2018	65,013,920	$ 10,874					83,545,043	(4,536,960)	(13,041,385)	65,977,572	(963,652)	610,637	1,470,554
Ending Balance, shares at Jun. 30, 2018		10,873,759
Gross proceeds from issuance of common stock	752,000	$ 50		$ 27			751,923			752,000
Gross proceeds from issuance of common stock, shares		50,875		26,809
Offering costs	(755,331)						(755,331)			(755,331)
Changes to redeemable common stock	(616,976)						(616,976)			(616,976)			616,976
Distributions	(1,710,635)							(1,710,635)		(1,710,635)
Distributions to noncontrolling interests	(3,993)										(3,993)
Distributions to preferred unitholders in our Operating Partnership												(88,874)
Issuance of shares for distribution reinvestment plan	616,976	$ 63					616,913			616,976
Issuance of shares for distribution reinvestment plan (in shares)		62,859
Stock based compensation expense	4,406						4,406			4,406
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(4,526,374)								(4,526,374)	(4,526,374)		88,874
Net loss attributable to the noncontrolling interests	(10,410)										(10,410)
Issuance of preferred equity in our Operating Partnership												5,691,116
Accretion of non-cash preferred equity issuance costs												7,344
Ending Balance at Sep. 30, 2018	58,763,583	$ 10,987		$ 27			83,545,978	(6,247,595)	(17,567,759)	59,741,638	(978,055)	6,309,097	2,087,530
Ending Balance, shares at Sep. 30, 2018		10,987,493		26,809
Beginning Balance at Dec. 31, 2018	52,304,923	$ 11,122	$ 36	$ 44			83,533,060	(7,981,638)	(22,263,678)	53,298,946	(994,023)	10,095,708	2,659,654
Beginning Balance, shares at Dec. 31, 2018		11,122,135	36,299	43,996
Gross proceeds from issuance of common stock	1,993,382	$ 160	$ 16	$ 23			1,993,183			1,993,382
Gross proceeds from issuance of common stock, shares		159,655	15,500	22,872
Offering costs	(425,357)						(425,357)			(425,357)
Reimbursement of offering costs by Advisor	6,470						6,470			6,470
Changes to redeemable common stock	(565,651)						(565,651)			(565,651)			565,651
Redemptions of common stock													(48,600)
Distributions	(1,726,681)							(1,726,681)		(1,726,681)
Distributions to noncontrolling interests	(2,690)										(2,690)
Distributions to preferred unitholders in our Operating Partnership												(238,240)
Issuance of shares for distribution reinvestment plan	565,651	$ 57					565,594			565,651
Issuance of shares for distribution reinvestment plan (in shares)		57,271	220	184
Stock based compensation expense	4,406						4,406			4,406
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(4,740,781)								(4,740,781)	(4,740,781)		238,240
Net loss attributable to the noncontrolling interests	(9,517)										(9,517)
Accretion of non-cash preferred equity issuance costs												11,649
Ending Balance at Mar. 31, 2019	47,404,155	$ 11,339	$ 52	$ 67			85,111,705	(9,708,319)	(27,004,459)	48,410,385	(1,006,230)	10,107,357	3,176,705
Ending Balance, shares at Mar. 31, 2019		11,339,061	52,019	67,052
Beginning Balance at Dec. 31, 2018	52,304,923	$ 11,122	$ 36	$ 44			83,533,060	(7,981,638)	(22,263,678)	53,298,946	(994,023)	10,095,708	2,659,654
Beginning Balance, shares at Dec. 31, 2018		11,122,135	36,299	43,996
Gross proceeds from issuance of common stock, shares					261,000	144,000
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(14,831,207)
Net loss attributable to the noncontrolling interests	(32,048)
Ending Balance at Sep. 30, 2019	37,573,935	$ 11,517	$ 76	$ 85	$ 261	$ 144	89,015,249	(13,320,596)	(37,094,883)	38,611,853	(1,037,918)	10,130,654	4,150,958
Ending Balance, shares at Sep. 30, 2019		11,516,609	76,393	84,854	261,422	143,713
Beginning Balance at Mar. 31, 2019	47,404,155	$ 11,339	$ 52	$ 67			85,111,705	(9,708,319)	(27,004,459)	48,410,385	(1,006,230)	10,107,357	3,176,705
Beginning Balance, shares at Mar. 31, 2019		11,339,061	52,019	67,052
Gross proceeds from issuance of common stock	1,120,761	$ 76	$ 18	$ 16			1,120,651			1,120,761
Gross proceeds from issuance of common stock, shares		76,163	18,100	16,277
Offering costs	(533,854)						(533,854)			(533,854)
Reimbursement of offering costs by Advisor	1,530						1,530			1,530
Changes to redeemable common stock	(588,006)						(588,006)			(588,006)			588,006
Redemptions of common stock	(9)	$ (9)								(9)			(115,028)
Redemptions of common stock (in shares)		(8,646)
Distributions	(1,779,287)							(1,779,287)		(1,779,287)
Distributions to noncontrolling interests	(5,164)										(5,164)
Distributions to preferred unitholders in our Operating Partnership												(243,810)
Issuance of shares for distribution reinvestment plan	588,006	$ 60	$ 1				587,945			588,006
Issuance of shares for distribution reinvestment plan (in shares)		59,296	393	275
Issuance of restricted stock	3	$ 3								3
Issuance of restricted stock (in shares)		2,500
Stock based compensation expense	5,374						5,374			5,374
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(4,644,175)								(4,644,175)	(4,644,175)		243,810
Net loss attributable to the noncontrolling interests	(10,336)										(10,336)
Accretion of non-cash preferred equity issuance costs												11,648
Ending Balance at Jun. 30, 2019	41,558,998	$ 11,469	$ 71	$ 83			85,705,345	(11,487,606)	(31,648,634)	42,580,728	(1,021,730)	10,119,005	3,649,683
Ending Balance, shares at Jun. 30, 2019		11,468,374	70,512	83,604
Gross proceeds from issuance of common stock	3,766,900				$ 261	$ 144	3,766,495			3,766,900
Gross proceeds from issuance of common stock, shares					261,333	143,710
Offering costs	(645,244)						(645,244)			(645,244)
Reimbursement of offering costs by Advisor	183,493						183,493			183,493
Changes to redeemable common stock	(595,568)						(595,568)			(595,568)			595,568
Redemptions of common stock	(15)	$ (15)								(15)			(94,293)
Redemptions of common stock (in shares)		(14,798)
Distributions	(1,832,990)							(1,832,990)		(1,832,990)
Distribution of common stock			$ 5	$ 1			(6)
Distribution of common stock (in shares)			5,307	909
Distributions to noncontrolling interests	(3,993)										(3,993)
Distributions to preferred unitholders in our Operating Partnership												(251,730)
Issuance of shares for distribution reinvestment plan	595,568	$ 63		$ 1			595,504			595,568
Issuance of shares for distribution reinvestment plan (in shares)		63,033	574	341	89	3
Stock based compensation expense	5,230						5,230			5,230
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(5,446,249)								(5,446,249)	(5,446,249)		251,730
Net loss attributable to the noncontrolling interests	(12,195)										(12,195)
Accretion of non-cash preferred equity issuance costs												11,649
Ending Balance at Sep. 30, 2019	$ 37,573,935	$ 11,517	$ 76	$ 85	$ 261	$ 144	$ 89,015,249	$ (13,320,596)	$ (37,094,883)	$ 38,611,853	$ (1,037,918)	$ 10,130,654	$ 4,150,958
Ending Balance, shares at Sep. 30, 2019		11,516,609	76,393	84,854	261,422	143,713