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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2013
Shares and Units [Abstract]      
OP units outstanding (shares) 245,500,000 245,500,000 245,500,000
Dividends and Distributions [Abstract]      
Partial dividend paid, per OP unit $ 0.0795    
Full quarter dividend, per share   $ 0.085  
Distributions paid to OP unit holders     $ 19.5
ESRT [Member]
      
Shares and Units [Abstract]      
OP units owned by the Company (shares) 95,600,000 95,600,000 95,600,000
OP units owned by the Company, percent     38.90%
Other Partners [Member]
      
Shares and Units [Abstract]      
OP units not owned by the Company (shares) 149,900,000 149,900,000 149,900,000
OP units not owned by the Company, percent     61.10%