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Condensed Consolidated Statements of Capital - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance   $ 1,982,863
Equity compensation   6,967
Distributions   (63,408)
Net income $ 31,359 50,504
Unrealized gain (loss) on valuation of interest rate swap agreements (14,367) (12,973)
Ending balance $ 1,963,953 $ 1,963,953
General Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   155,841
Beginning balance   $ 1,154,136
Conversion of operating partnership units to ESRT Partner's Capital (in units)   2,704
Conversion of operating partnership units to ESRT Partner's Capital   $ 9,144
Equity compensation (in units)   29
Equity compensation   $ 294
Distributions   (33,118)
Net income   26,569
Unrealized gain (loss) on valuation of interest rate swap agreements   $ (6,889)
Ending balance (in units) 158,574 158,574
Ending balance $ 1,150,136 $ 1,150,136
Limited Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   93,075
Beginning balance   $ 793,360
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (969)
Conversion of operating partnership units to ESRT Partner's Capital   $ (8,235)
Equity compensation (in units)   1,296
Equity compensation   $ 6,673
Distributions   (19,536)
Net income   15,161
Unrealized gain (loss) on valuation of interest rate swap agreements   $ (3,931)
Ending balance (in units) 93,402 93,402
Ending balance $ 783,492 $ 783,492
Limited Partner | Series ES operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   35,728
Beginning balance   $ 20,091
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (1,164)
Conversion of operating partnership units to ESRT Partner's Capital   $ (632)
Distributions   (7,334)
Net income   5,904
Unrealized gain (loss) on valuation of interest rate swap agreements   $ (1,531)
Ending balance (in units) 34,564 34,564
Ending balance $ 16,498 $ 16,498
Limited Partner | Series 60 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   9,701
Beginning balance   $ 4,880
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (368)
Conversion of operating partnership units to ESRT Partner's Capital   $ (179)
Distributions   (1,984)
Net income   1,601
Unrealized gain (loss) on valuation of interest rate swap agreements   $ (415)
Ending balance (in units) 9,333 9,333
Ending balance $ 3,903 $ 3,903
Limited Partner | Series 250 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   4,747
Beginning balance   $ 2,392
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (203)
Conversion of operating partnership units to ESRT Partner's Capital   $ (98)
Distributions   (968)
Net income   801
Unrealized gain (loss) on valuation of interest rate swap agreements   $ (207)
Ending balance (in units) 4,544 4,544
Ending balance $ 1,920 $ 1,920
Private Perpetual Preferred Units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   1,560
Beginning balance   $ 8,004
Distributions   (468)
Net income   $ 468
Ending balance (in units) 1,560 1,560
Ending balance $ 8,004 $ 8,004