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Capital (Tables)
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]  
Summary of ERST Restricted Stock and LTIP Unit
The following is a summary of ESRT restricted stock and LTIP unit activity for the three months ended March 31, 2018:
 
Restricted Stock
 
LTIP Units
 
Weighted Average Grant Fair Value
Unvested balance at December 31, 2017
90,791

 
3,588,609

 
$
11.20

Vested
(28,123
)
 
(437,558
)
 
14.19

Granted
39,608

 
2,654,801

 
8.38

Forfeited or unearned
(6,101
)
 
(94,173
)
 
8.39

Unvested balance at March 31, 2018
96,175

 
5,711,679

 
$
9.70
Earnings Per Unit
Earnings per unit for the three months ended March 31, 2018 and 2017 is computed as follows (amounts in thousands, except per share amounts):
 
Three Months Ended,
 
March 31, 2018
 
March 31, 2017
Numerator:
 
 
 
Net income
$
18,058

 
$
19,145

Private perpetual preferred unit distributions
(234
)
 
(234
)
Earnings allocated to unvested units
(162
)
 
(154
)
Net income attributable to common unitholders - basic and diluted
$
17,662

 
$
18,757

 
 
 
 
Denominator:
 
 
 
Weighted average units outstanding - basic
296,824

 
296,388

Effect of dilutive securities:
 
 
 
  Stock-based compensation plans

3

 
775

  Exchangeable senior notes
—

 
799

Weighted average units outstanding - diluted
296,827

 
297,962

 
 
 
 
Earnings per share:
 
 
 
Basic
$
0.06

 
$
0.06

Diluted
$
0.06

 
$
0.06