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Condensed Consolidated Statements of Capital - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance   $ 1,381,097
Equity compensation   4,259
Distributions   (68,920)
Net income $ 26,085 60,558
Unrealized loss on valuation of interest rate swap agreements (4,384) (4,384)
Ending balance $ 1,372,610 $ 1,372,610
General Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   107,191
Beginning balance   $ 468,638
Conversion of operating partnership units to ESRT Partner's Capital (in units)   10,743
Conversion of operating partnership units to ESRT Partner's Capital   $ 53,120
Equity compensation (in units)   20
Equity compensation   $ 294
Distributions   (29,056)
Net income   25,478
Unrealized loss on valuation of interest rate swap agreements   $ (1,903)
Ending balance (in units) 117,954 117,954
Ending balance $ 516,571 $ 516,571
Limited Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   100,211
Beginning balance   $ 868,163
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (5,829)
Conversion of operating partnership units to ESRT Partner's Capital   $ (50,267)
Equity compensation (in units)   456
Equity compensation   $ 3,965
Distributions   (24,775)
Net income   21,824
Unrealized loss on valuation of interest rate swap agreements   $ (1,578)
Ending balance (in units) 94,838 94,838
Ending balance $ 817,332 $ 817,332
Limited Partner | Series ES operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   42,365
Beginning balance   $ 26,488
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (3,374)
Conversion of operating partnership units to ESRT Partner's Capital   $ (2,025)
Distributions   (10,219)
Net income   8,913
Unrealized loss on valuation of interest rate swap agreements   $ (640)
Ending balance (in units) 38,991 38,991
Ending balance $ 22,517 $ 22,517
Limited Partner | Series 60 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   11,546
Beginning balance   $ 6,567
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (989)
Conversion of operating partnership units to ESRT Partner's Capital   $ (536)
Distributions   (2,778)
Net income   2,436
Unrealized loss on valuation of interest rate swap agreements   $ (175)
Ending balance (in units) 10,557 10,557
Ending balance $ 5,514 $ 5,514
Limited Partner | Series 250 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   5,790
Beginning balance   $ 3,237
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (551)
Conversion of operating partnership units to ESRT Partner's Capital   $ (292)
Distributions   (1,390)
Net income   1,205
Unrealized loss on valuation of interest rate swap agreements   $ (88)
Ending balance (in units) 5,239 5,239
Ending balance $ 2,672 $ 2,672
Private Perpetual Preferred Units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   1,560
Beginning balance   $ 8,004
Distributions   (702)
Net income   $ 702
Ending balance (in units) 1,560 1,560
Ending balance $ 8,004 $ 8,004