Consolidated Statement of Equity - 9 months ended Sep. 30, 2018 - USD ($)	Total	Redeemable Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions [Member]	Accumulated Deficit [Member]	Strategic Storage Growth Trust, Inc. Equity [Member]	Noncontrolling Interests in our Operating Partnership [Member]	Preferred Equity [Member]	Common Stock Class A [Member]	Common Stock Class W
Beginning Balance at Dec. 31, 2017	$ 60,255,483		$ 68,799,264	$ (1,379,950)	$ (6,233,945)	$ 61,194,317	$ (938,834)		$ 8,948
Beginning Balance, shares at Dec. 31, 2017									8,948,551
Gross proceeds from issuance of common stock	16,991,578		16,989,713			16,991,578			$ 1,838	$ 27
Gross proceeds from issuance of common stock, shares									1,838,472	26,809
Offering costs	(2,248,180)		(2,248,180)			(2,248,180)
Changes to redeemable common stock	(1,783,686)	$ 1,783,686	(1,783,686)			(1,783,686)
Distributions	(4,867,645)			(4,867,645)		(4,867,645)
Distributions to noncontrolling interests	(11,849)						(11,849)
Issuance of shares for distribution reinvestment plan	1,783,686		1,783,493			1,783,686			$ 193
Issuance of shares for distribution reinvestment plan (in shares)									192,970
Issuance of restricted stock	8					8			$ 8
Issuance of restricted stock (in shares)									7,500
Stock based compensation expense	5,374		5,374			5,374
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.	(11,333,814)				(11,333,814)	(11,333,814)
Net loss attributable to the noncontrolling interests	(27,372)						(27,372)
Ending Balance at Sep. 30, 2018	58,763,583		$ 83,545,978	$ (6,247,595)	$ (17,567,759)	$ 59,741,638	$ (978,055)		$ 10,987	$ 27
Ending Balance, shares at Sep. 30, 2018									10,987,493	26,809
Beginning Balance at Dec. 31, 2017	303,844	303,844
Distributions to preferred unitholders in our Operating Partnership								$ (92,543)
Net loss attributable to Strategic Student & Senior Housing Trust, Inc.								92,543
Issuance of preferred equity in our Operating Partnership								6,301,116
Accretion of non-cash preferred equity issuance costs								7,981
Ending Balance at Sep. 30, 2018	$ 2,087,530	$ 2,087,530						$ 6,309,097