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Description of Business and Organization Description of Business and Organization Narrative (Details) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Oct. 06, 2013
entity
Dec. 31, 2013
entity
sqft
Oct. 06, 2013
Predecessor [Member]
Dec. 31, 2012
Predecessor [Member]
Dec. 31, 2011
Predecessor [Member]
Dec. 31, 2013
Predecessor [Member]
sqft
Sep. 28, 2012
Predecessor [Member]
New York State Supreme Court, New York County [Member]
Dec. 31, 2013
Secured Revolving and Term Credit Facility [Member]
Dec. 31, 2013
ESRT [Member]
Sep. 28, 2012
ESRT [Member]
Predecessor [Member]
New York State Supreme Court, New York County [Member]
Oct. 06, 2013
Accredited Investor [Member]
Oct. 06, 2013
Non-accredited Prior Investors [Member]
Oct. 06, 2013
Common Class A [Member]
Dec. 31, 2013
Common Class A [Member]
ESRT [Member]
Oct. 06, 2013
Common Class A [Member]
Accredited Investor [Member]
ESRT [Member]
Oct. 06, 2013
Series PR Operating Partnership Units [Member]
Oct. 06, 2013
Series PR Operating Partnership Units [Member]
Accredited Investor [Member]
ESRT [Member]
Oct. 06, 2013
Common Class B [Member]
Accredited Investor [Member]
ESRT [Member]
Dec. 31, 2013
Office Building [Member]
office_and_property
sqft
Dec. 31, 2013
Office Building [Member]
Manhattan [Member]
sqft
office_and_property
Dec. 31, 2013
Office Building [Member]
Fairfield County, Connecticut and Westchester County, New York [Member]
office_and_property
sqft
Dec. 31, 2013
Retail Site [Member]
Manhattan and Westport, Connecticut [Member]
sqft
Dec. 31, 2013
Retail Site [Member]
Manhattan [Member]
office_and_property
sqft
Dec. 31, 2013
Retail Site [Member]
Westport, Connecticut [Member]
office_and_property
Dec. 31, 2013
Other Property [Member]
Stamford, Connecticut [Member]
sqft
Dec. 31, 2013
Development Parcel [Member]
Consolidated Properties [Member]
Predecessor [Member]
parcel
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                                                    
Par value                           $ 0.01                        
OP units owned by the Company, percent                 38.90%                                  
Area of real estate property   8,400,000       380,000                         7,700,000 5,900,000 1,800,000 204,175 418,377   380,000  
Number of properties                                     12 7 5   4 2   1
Issuance of Common Stock (in shares)                         82,200,000   12,100,000     1,100,000                
Share price (in dollars per share)                         $ 13.00                          
Operating partnership units issued during period (in shares)                     149,000,000         82,200,000 13,200,000                  
Operating partnership units issued during period $ 2,800,000,000                   $ 2,100,000,000 $ 733,300,000                            
Current borrowing capacity               800,000,000.0                                    
Maximum borrowing capacity               1,250,000,000.00                                    
Number of entities to be treated as TRS's   2                                                
Damages awarded             55,000,000.0                                      
Percent of damages awarded required to be in cash             80.00%                                      
Maximum percent of freely-tradable common stock or partnership units             20.00%     20.00%                                
Contributions     $ 8,223,000 $ 2,107,000 $ 2,153,000   $ 55,000,000.0                                      
Number of entities acquired 4