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Commitments and Contingencies - Litigation (Details)
Oct. 14, 2014
participant
Sep. 04, 2013
participant
May. 17, 2013
USD ($)
participant
Jan. 28, 2013
participant
Sep. 28, 2012
USD ($)
llc
Mar. 14, 2014
investor
Dec. 24, 2013
claim
Jun. 20, 2013
investor
Mar. 31, 2012
claim
Loss Contingencies [Line Items]                  
Number of additional investors who apposed the settlement (investor) | investor               1  
Number of investors who had filed a notice of appeal (investor) | investor           1      
Pending Litigation [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Number of claims (claim) | claim             4    
Predecessor [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Damages awarded         $ 55,000,000        
Percent of damages awarded required to be in cash         80.00%        
Number of LLC's (llc) | llc         3        
Maximum difference between exchange value and prospectus statement         10.00%        
Loss contingency, proceeds from issuance of common stock, threshold amount, consolidation considerations         $ 600,000,000        
Number of plaintiffs opting out of settlement (participant) | participant 12 2 12            
Attorney fees sought     $ 15,000,000            
Attorney expenses sought     295,895            
Attorney fees awarded     11,590,000            
Attorney expenses awarded     $ 265,282            
Number of plaintiffs opting out of settlement who could pursue appraisal (participant) | participant   12              
Predecessor [Member] | New York State Supreme Court, New York County [Member] | ESRT [Member]                  
Loss Contingencies [Line Items]                  
Maximum percent of freely-tradable common stock or partnership units         20.00%        
Predecessor [Member] | Pending Litigation [Member]                  
Loss Contingencies [Line Items]                  
Number of plaintiffs (participant) | participant       6          
Predecessor [Member] | Pending Litigation [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Number of claims (claim) | claim                 5
Number of plaintiffs (participant) | participant 4,500 6 4,500