Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 30, 2018
Entity Registrant Name	Empire State Realty Trust, Inc.
Entity Central Index Key	0001541401
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Class A Common Stock
Entity Common Stock, Shares Outstanding		173,008,231
Class B Common Stock
Entity Common Stock, Shares Outstanding		1,038,804