Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 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	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Entity Filer Category	Large Accelerated Filer
Class A Common Stock
Entity Common Stock, Shares Outstanding		167,009,180
Class B Common Stock
Entity Common Stock, Shares Outstanding		1,045,240