Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 30, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	SRG
Entity Registrant Name	SERITAGE GROWTH PROPERTIES
Entity Central Index Key	0001628063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-37420
Entity Tax Identification Number	383976287
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	New York
Entity Address, Postal Zip Code	10110
City Area Code	212
Local Phone Number	355-7800
Class A Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		36,828,522
Class B Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,247,060
Class C Common Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0