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Capital (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2018:
 
Restricted Stock
 
LTIP Units
 
Weighted Average Grant Fair Value
Unvested balance at December 31, 2017
90,791

 
3,588,609

 
$
11.20

Vested
(30,693
)
 
(492,877
)
 
14.58

Granted
39,608

 
2,719,801

 
8.54

Forfeited or unearned
(7,811
)
 
(103,490
)
 
8.52

Unvested balance at September 30, 2018
91,895

 
5,712,043

 
$
9.68
Earnings Per Unit
Earnings per unit for the three and nine months ended September 30, 2018 and 2017 is computed as follows (amounts in thousands, except per share amounts):
 
Three Months Ended,
 
Nine Months Ended,
 
September 30, 2018
 
September 30, 2017
 
September 30, 2018
 
September 30, 2017
Numerator:
 
 
 
 
 
 
 
Net income
$
29,230

 
$
35,489

 
$
77,472

 
$
85,993

Private perpetual preferred unit distributions
(234
)
 
(234
)
 
(702
)
 
(702
)
Earnings allocated to unvested units
(212
)
 
(228
)
 
(586
)
 
(582
)
Net income attributable to common unitholders - basic and diluted
$
28,784

 
$
35,027

 
$
76,184

 
$
84,709

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average units outstanding - basic
297,478

 
296,389

 
297,180

 
296,389

Effect of dilutive securities:
 
 
 
 
 
 
 
  Stock-based compensation plans

—

 
762

 
1

 
848

  Exchangeable senior notes
—

 
720

 
—

 
852

Weighted average units outstanding - diluted
297,478

 
297,871

 
297,181

 
298,089

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.10

 
$
0.12

 
$
0.26

 
$
0.29

Diluted
$
0.10

 
$
0.12

 
$
0.26

 
$
0.28