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Description of Business and Organization Narrative (Details) (USD $)
 0 Months Ended 3 Months Ended
Oct. 06, 2013
entity
Mar. 31, 2014
entity
sqft
Mar. 31, 2013
entity
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
OP units owned by the Company, percent   38.90%  
Area of real estate property   8,400,000  
Number of entities to be treated as TRS's   2  
Number of entities acquired 4   4
Office Building [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   7,700,000  
Number of properties   12  
Office Building [Member] | Manhattan [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   5,900,000  
Number of properties   7  
Office Building [Member] | Fairfield County, Connecticut and Westchester County, New York [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   1,800,000  
Number of properties   5  
Development Parcel [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Number of properties   1  
Retail Site [Member] | Manhattan and Westport, Connecticut [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   204,175  
Retail Site [Member] | Manhattan [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   419,812  
Number of properties   4  
Retail Site [Member] | Westport, Connecticut [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Number of properties   2  
Other Property [Member] | Stamford, Connecticut [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Area of real estate property   380,000  
ESRT [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
OP units owned by the Company, percent   38.90%  
Common Class A [Member] | ESRT [Member]
      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Par value   $ 0.01