Organization - Additional Information (Detail)											1 Months Ended	9 Months Ended
	Jul. 31, 2024 USD ($)	Apr. 17, 2020	Apr. 01, 2020 USD ($)	Mar. 31, 2020 shares	Jul. 10, 2019 USD ($)	May 01, 2018 USD ($) shares	Sep. 28, 2017 USD ($) shares	Jan. 27, 2017 USD ($) shares	Oct. 05, 2016 USD ($) shares	Oct. 04, 2016 USD ($) shares	Jun. 30, 2019	Sep. 30, 2024 USD ($) Property Employee $ / shares shares
Organization and Nature of Operations [Line Items]
Date of formation of company												Oct. 04, 2016
Shares issued pursuant to distribution reinvestment plan | shares				0
Number of senior housing properties | Property												4
Number of employees | Employee												0
Dealer manager agreement termination date		Jun. 16, 2020
Sale of property												$ 70,863,051
Repayment of loan												$ 29,500,000
Fayetteville Mortgage Loan [Member]
Organization and Nature of Operations [Line Items]
Repayment of loan	$ 34,500,000
Key Bank Bridge Loan [Member]
Organization and Nature of Operations [Line Items]
Repayment of loan	25,400,000
Fayetteville Property [Member]
Organization and Nature of Operations [Line Items]
Date of property sold												Jul. 31, 2024
Sale of property	$ 72,250,000
Strategic Storage Operating Partnership IV, L.P. [Member]
Organization and Nature of Operations [Line Items]
Date of formation of company												Oct. 05, 2016
Capital contribution									$ 1,000
Percentage of common units of limited partnership interest of operating partnership												99.80%
SSSHT Property Management, LLC (Property Manager) [Member]
Organization and Nature of Operations [Line Items]
Date of formation of company												Oct. 03, 2016
Class Y Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares												$ 6.34
Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares												6.34
Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares												6.34
Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares												6.34
Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares												$ 6.34
Private Offering [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares								10,700,000
Shares issued pursuant to distribution reinvestment plan | shares								1,000,000
Gross proceeds from issuance of common stock								$ 91,500,000				$ 5,700,000
Private Offering [Member] | Class Y Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan | shares												10,000
Private Offering [Member] | Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan | shares												1,000
Private Offering [Member] | Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan | shares												610,000
Private Offering [Member] | Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan | shares												8,000
Private Offering [Member] | Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan | shares												3,000
Primary Offering [Member]
Organization and Nature of Operations [Line Items]
Issuance of common stock			$ 0
Gross proceeds from issuance of common stock												$ 17,100,000
Primary Offering [Member] | Class Y Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares												1,100,000
Primary Offering [Member] | Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares												165,000
Primary Offering [Member] | Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares												362,000
Primary Offering [Member] | Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares												70,000
Primary Offering [Member] | Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares												83,000
SSSHT Advisor, LLC (Advisor) [Member] | Strategic Storage Operating Partnership IV, L.P. [Member]
Organization and Nature of Operations [Line Items]
Advisor purchased a limited partnership interest in operating partnership							$ 199,000		$ 1,000
Advisor acquired limited partnership interest in operating partnership, number of partnership units | shares							25,447.57		111.11
Capital contribution							$ 200,000
Percentage of common units of limited partnership interest of operating partnership												0.20%
SSSHT Advisor, LLC (Advisor) [Member] | Strategic Transfer Agent Services, LLC (Transfer Agent) [Member]
Organization and Nature of Operations [Line Items]
Ownership percentage												100.00%
SSSHT Advisor, LLC (Advisor) [Member] | Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued | shares										111.11
Issuance of common stock										$ 1,000
Affiliate [Member] | SSSHT Property Management, LLC (Property Manager) [Member]
Organization and Nature of Operations [Line Items]
Percentage owned by affiliate												2.50%
SmartStop Asset Management, LLC (Sponsor) [Member] | SSSHT Advisor, LLC (Advisor) [Member]
Organization and Nature of Operations [Line Items]
Percentage of economic interest owned by sponsor											97.50%
Percentage of voting membership interests owned by sponsor											100.00%
SmartStop Asset Management, LLC (Sponsor) [Member] | SSSHT Property Management, LLC (Property Manager) [Member]
Organization and Nature of Operations [Line Items]
Percentage of property management owned by sponsor											100.00%
SmartStop Asset Management, LLC (Sponsor) [Member] | Select Capital Corporation (Dealer Manager) [Member]
Organization and Nature of Operations [Line Items]
Dealer manager agreement termination date												Jun. 16, 2020
Percentage of non-voting equity interest												15.00%
Maximum [Member] | Class Y Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issuable pursuant to distribution reinvestment plan					$ 700,000,000
Maximum [Member] | Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issuable pursuant to distribution reinvestment plan					$ 300,000,000
Maximum [Member] | Private Offering [Member]
Organization and Nature of Operations [Line Items]
Issuance of common stock								100,000,000
Maximum [Member] | Primary Offering [Member] | S-11 Registration Statement [Member]
Organization and Nature of Operations [Line Items]
Common stock shares registered for sale to public | shares						1,000,000,000
Maximum [Member] | Primary and Public Offering [Member] | S-11 Registration Statement [Member]
Organization and Nature of Operations [Line Items]
Shares issuable pursuant to distribution reinvestment plan						$ 95,000,000
Minimum [Member] | Private Offering [Member]
Organization and Nature of Operations [Line Items]
Issuance of common stock								$ 1,000,000