Organization - Additional Information (Detail)											1 Months Ended	6 Months Ended
	Apr. 17, 2020	Apr. 01, 2020 USD ($)	Mar. 31, 2020 shares	Jul. 10, 2019 USD ($) $ / shares	Jun. 21, 2019 shares	May 01, 2018 USD ($) shares	Sep. 28, 2017 USD ($) shares	Jan. 27, 2017 USD ($) shares	Oct. 05, 2016 USD ($) shares	Oct. 04, 2016 USD ($) shares	Jun. 30, 2019	Jun. 30, 2022 USD ($) Property Employee $ / shares shares	Dec. 31, 2021 shares
Organization and Nature of Operations [Line Items]
Date of formation of company												Oct. 04, 2016
Number of senior housing properties | Property												4
Number of student housing properties | Property												1
Number of employees | Employee												0
Dealer manager agreement termination date	Jun. 16, 2020
Distribution Reinvestment Plan [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan			0
Distributions reinvestment | $												$ 0
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]
Common stock, shares authorized												200,000,000	200,000,000
Estimated value per share | $ / shares												$ 6.08
Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Common stock, shares authorized												70,000,000	70,000,000
Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Common stock, shares authorized												245,000,000	245,000,000
Estimated value per share | $ / shares												$ 6.08
Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Common stock, shares authorized												115,000,000	115,000,000
Estimated value per share | $ / shares												$ 6.08
One-time stock distribution to stockholders, shares issued for each share holder					0.07527
Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Common stock, shares authorized												70,000,000	70,000,000
Estimated value per share | $ / shares												$ 6.08
One-time stock distribution to stockholders, shares issued for each share holder					0.01075
Private Offering [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued								10,700,000
Shares issued pursuant to distribution reinvestment plan								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												10,000
Private Offering [Member] | Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan												1,000
Private Offering [Member] | Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan												610,000
Private Offering [Member] | Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan												8,000
Private Offering [Member] | Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issued pursuant to distribution reinvestment plan												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												1,100,000
Common stock sales price per share | $ / shares				$ 9.30
Primary Offering [Member] | Class Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued												165,000
Common stock sales price per share | $ / shares				9.30
Primary Offering [Member] | Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued												360,000
Primary Offering [Member] | Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued												70,000
Primary Offering [Member] | Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Number of common stock issued												83,000
Primary and Public Offering [Member] | Class A, T, W, Y and Z Common Stock [Member]
Organization and Nature of Operations [Line Items]
Shares issuable pursuant to distribution reinvestment plan per share | $ / shares				$ 9.30
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%
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							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										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 in advisor												2.50%
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						1,000,000,000.0
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