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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Feb. 22, 2019
Jun. 30, 2018
Entity Registrant Name Empire State Realty OP, L.P.    
Entity Central Index Key 0001553079    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 0
Series ES Operating Partnership Units Limited Partners      
Entity Common Stock, Shares Outstanding   29,238,349  
Series 60 Operating Partnership Units Limited Partners      
Entity Common Stock, Shares Outstanding   7,944,584  
Series 250 Operating Partnership Units Limited Partners      
Entity Common Stock, Shares Outstanding   3,993,052