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Consolidated Statements of Capital - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance   $ 1,977,737   $ 1,982,863   $ 1,372,686 $ 1,977,737 $ 1,982,863 $ 1,372,686
Issuance of OP units, net of costs             4,749   611,206
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             0 0 0
Equity compensation             18,785 14,100 9,729
Distributions             (126,539) (126,963) (114,954)
Net income $ 39,781 $ 18,058 $ 32,260 $ 19,145 $ 33,008 $ 16,705 117,253 118,253 107,250
Unrealized loss on valuation of interest rate swap agreements                 (3,054)
Other comprehensive income (loss)             (876) (10,516) (3,054)
Ending balance $ 1,991,109   $ 1,977,737   $ 1,982,863   $ 1,991,109 $ 1,977,737 $ 1,982,863
General Partner | Series PR Operating Partnership Units                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   161,477,000   155,841,000   120,023,000 161,477,000 155,841,000 120,023,000
Beginning balance   $ 1,168,282   $ 1,154,136   $ 524,729 $ 1,168,282 $ 1,154,136 $ 524,729
Issuance of OP units, net (in units)             284,000   29,611,000
Issuance of OP units, net of costs             $ 4,749   $ 611,206
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)             13,127,000 5,615,000 6,167,000
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             $ 70,779 $ 23,435 $ 23,678
Equity compensation (in units)             24,000 21,000 40,000
Equity compensation             $ 417 $ 468 $ 357
Distributions             (70,854) (66,789) (55,812)
Net income             65,603 62,647 51,456
Unrealized loss on valuation of interest rate swap agreements                 $ (1,478)
Other comprehensive income (loss)             $ (494) $ (5,615)  
Ending balance (in units) 174,912,000   161,477,000   155,841,000   174,912,000 161,477,000 155,841,000
Ending balance $ 1,238,482   $ 1,168,282   $ 1,154,136   $ 1,238,482 $ 1,168,282 $ 1,154,136
Limited Partners | Series PR Operating Partnership Units                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   91,760,000   93,075,000   93,863,000 91,760,000 93,075,000 93,863,000
Beginning balance   $ 778,279   $ 793,360   $ 809,901 $ 778,279 $ 793,360 $ 809,901
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)             (8,168,000) (2,611,000) (2,657,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             $ (68,386) $ (21,997) $ (22,264)
Equity compensation (in units)             2,610,000 1,296,000 1,869,000
Equity compensation             $ 18,368 $ 13,632 $ 9,372
Distributions             (36,284) (38,969) (37,621)
Net income             33,383 35,430 34,977
Unrealized loss on valuation of interest rate swap agreements                 $ (1,005)
Other comprehensive income (loss)             $ (252) $ (3,177)  
Ending balance (in units) 86,202,000   91,760,000   93,075,000   86,202,000 91,760,000 93,075,000
Ending balance $ 725,108   $ 778,279   $ 793,360   $ 725,108 $ 778,279 $ 793,360
Limited Partners | Series ES Operating Partnership Units Limited Partners                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   33,774,000   35,728,000   38,262,000 33,774,000 35,728,000 38,262,000
Beginning balance   $ 17,132   $ 20,091   $ 22,074 $ 17,132 $ 20,091 $ 22,074
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)             (3,645,000) (1,954,000) (2,534,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             $ (1,809) $ (978) $ (1,075)
Distributions             (13,161) (14,477) (14,642)
Net income             12,330 13,726 14,140
Unrealized loss on valuation of interest rate swap agreements                 $ (406)
Other comprehensive income (loss)             $ (93) $ (1,230)  
Ending balance (in units) 30,129,000   33,774,000   35,728,000   30,129,000 33,774,000 35,728,000
Ending balance $ 14,399   $ 17,132   $ 20,091   $ 14,399 $ 17,132 $ 20,091
Limited Partners | Series 60 Operating Partnership Units Limited Partners                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   8,988,000   9,701,000   10,318,000 8,988,000 9,701,000 10,318,000
Beginning balance   $ 3,992   $ 4,880   $ 5,366 $ 3,992 $ 4,880 $ 5,366
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)             (968,000) (713,000) (617,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             $ (423) $ (310) $ (218)
Distributions             (3,532) (3,889) (3,985)
Net income             3,373 3,637 3,827
Unrealized loss on valuation of interest rate swap agreements                 $ (110)
Other comprehensive income (loss)             $ (25) $ (326)  
Ending balance (in units) 8,020,000   8,988,000   9,701,000   8,020,000 8,988,000 9,701,000
Ending balance $ 3,385   $ 3,992   $ 4,880   $ 3,385 $ 3,992 $ 4,880
Limited Partners | Series 250 Operating Partnership Units Limited Partners                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   4,410,000   4,747,000   5,106,000 4,410,000 4,747,000 5,106,000
Beginning balance   $ 2,048   $ 2,392   $ 2,612 $ 2,048 $ 2,392 $ 2,612
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital (in units)             (346,000) (337,000) (359,000)
Conversion of operating partnership units to Class A shares and Class B shares to ESRT partner's capital             $ (161) $ (150) $ (121)
Distributions             (1,772) (1,903) (1,958)
Net income             1,628 1,877 1,914
Unrealized loss on valuation of interest rate swap agreements                 $ (55)
Other comprehensive income (loss)             $ (12) $ (168)  
Ending balance (in units) 4,064,000   4,410,000   4,747,000   4,064,000 4,410,000 4,747,000
Ending balance $ 1,731   $ 2,048   $ 2,392   $ 1,731 $ 2,048 $ 2,392
Private Perpetual Preferred Units                  
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Beginning balance (in units)   1,560,000   1,560,000   1,560,000 1,560,000 1,560,000 1,560,000
Beginning balance   $ 8,004   $ 8,004   $ 8,004 $ 8,004 $ 8,004 $ 8,004
Distributions             (936) (936) (936)
Net income             $ 936 $ 936 $ 936
Ending balance (in units) 1,560,000   1,560,000   1,560,000   1,560,000 1,560,000 1,560,000
Ending balance $ 8,004   $ 8,004   $ 8,004   $ 8,004 $ 8,004 $ 8,004