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Capital (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017:
 
Restricted Stock
 
LTIP Units
 
Weighted Average Grant Fair Value
Unvested balance at December 31, 2016
107,793

 
2,881,629

 
$
10.01

Vested
(17,923
)
 
(323,982
)
 
13.74

Granted
34,407

 
1,372,574

 
13.77

Forfeited or unearned
(2,509
)
 
(77,227
)
 
5.36

Unvested balance at September 30, 2017
121,768

 
3,852,994

 
$
11.11
Earnings Per Unit
Earnings per unit for the three and nine months ended September 30, 2017 and 2016 is computed as follows (amounts in thousands, except per share amounts):
 
Three Months Ended,
 
Nine Months Ended,
 
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Numerator:
 
 
 
 
 
 
 
Net income
$
35,489

 
$
32,897

 
$
85,993

 
$
74,242

Private perpetual preferred unit distributions
(234
)
 
(234
)
 
(702
)
 
(702
)
Earnings allocated to unvested units
(228
)
 
(225
)
 
(582
)
 
(575
)
Net income attributable to common unitholders - basic and diluted
$
35,027

 
$
32,438

 
$
84,709

 
$
72,965

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average units outstanding - basic
296,389

 
278,739

 
296,389

 
270,388

Effect of dilutive securities:
 
 
 
 
 
 
 
  Stock-based compensation plans

762

 
1,090

 
848

 
378

  Exchangeable senior notes
720

 
785

 
852

 
262

Weighted average units outstanding - diluted
297,871

 
280,614

 
298,089

 
271,028

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Basic
0.12

 
0.12

 
0.29

 
0.27

Diluted
$
0.12

 
$
0.12

 
$
0.28

 
$
0.27