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Related Party Transactions Formation Transactions (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Oct. 08, 2013
Dec. 31, 2013
Senior Management [Member]
Oct. 06, 2013
Common Class A [Member]
Dec. 31, 2013
Anthony E. Malkin, Scott D. Malkin and Cynthia M. Blumenthal [Member]
Dec. 31, 2013
Anthony E. Malkin [Member]
Dec. 31, 2013
Peter L. Malkin [Member]
Dec. 31, 2013
Malkin Group [Member]
Dec. 31, 2013
ESRT [Member]
Common Class B [Member]
Senior Management [Member]
Dec. 31, 2013
ESRT [Member]
Anthony E. Malkin, Scott D. Malkin and Cynthia M. Blumenthal [Member]
Dec. 31, 2013
ESRT [Member]
Anthony E. Malkin [Member]
Common Class A [Member]
Dec. 31, 2013
ESRT [Member]
Anthony E. Malkin [Member]
Common Class B [Member]
Dec. 31, 2013
ESRT [Member]
Peter L. Malkin [Member]
Common Class A [Member]
Dec. 31, 2013
ESRT [Member]
Peter L. Malkin [Member]
Common Class B [Member]
Dec. 31, 2013
ESRT [Member]
Malkin Group [Member]
Common Class A [Member]
Dec. 31, 2013
ESRT [Member]
Malkin Group [Member]
Common Class B [Member]
Oct. 08, 2013
Predecessor [Member]
Investor [Member]
Oct. 08, 2013
Predecessor [Member]
Malkin Group [Member]
Related Party Transaction [Line Items]                                  
Proceeds from Issuance Initial Public Offering, Net of Costs of Issuance $ 2,800,000,000                                
Payments of Capital Distribution                               180,000,000 38,900,000
Representation, Warranty and Indemnity Agreement Deductible       1,000,000                          
Representation, Warranty and Indemnity Agreement Cap       25,000,000                          
Ownership Interests Pledged As Security for Representation, Warranty and Indemnification Agreement                 $ 25,000,000                
Stock Issued During Period, Shares, New Issues     82,200,000         2,407   210,289 586,095 2,772 100,084 396,025 747,435    
Partners' Capital Account, Units, Sale of Units   1,167,336     28,718,631 6,027,867 37,748,249                    
Related Party, Ownership Interest, Diluted Basis, Percent               0.50%     12.00%   2.50%   15.80%