Organization - Additional Information (Detail)										1 Months Ended	3 Months Ended
	Apr. 17, 2020	Apr. 01, 2020 USD ($)	Mar. 31, 2020 shares	Jul. 10, 2019 USD ($) $ / 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 ($) shares	Jun. 30, 2019	Mar. 31, 2022 USD ($) Property Employee $ / shares 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]
Estimated value per share | $ / shares											$ 6.08
Class A Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares											6.08
Class T Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares											6.08
Class W Common Stock [Member]
Organization and Nature of Operations [Line Items]
Estimated value per share | $ / shares											$ 6.08
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