Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Aug. 08, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Registrant Name	SERITAGE GROWTH PROPERTIES
Entity Central Index Key	0001628063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-37420
Entity Tax Identification Number	38-3976287
Entity Address, Address Line One	500 Fifth Avenue
Entity Address, Address Line Two	Suite 1530
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10110
Entity Incorporation, State or Country Code	MD
City Area Code	212
Local Phone Number	355-7800
Document Quarterly Report	true
Document Transition Report	false
Series A Cumulative Redeemable Preferred Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	7.00% Series A cumulative redeemable preferred shares of beneficial interest, par value $0.01 per share
Trading Symbol	SRG-PA
Security Exchange Name	NYSE
Class A Common Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A common shares of beneficial interest, par value $0.01 per share
Trading Symbol	SRG
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		56,032,381
Class B Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Class C Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0