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Condensed Consolidated Statements of Capital - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance   $ 1,372,686
Issuance of OP units, net of costs   611,278
Equity compensation   7,254
Distributions   (83,316)
Net income $ 32,897 74,242
Change in unrealized gain (loss) on valuation of interest rate swap agreements 930 (29,305)
Ending balance $ 1,952,839 $ 1,952,839
General Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   120,023,000
Beginning balance   $ 524,729
Issuance of OP units, net of costs (in units)   29,611,000
Issuance of OP units, net of costs   $ 611,278
Conversion of operating partnership units to ESRT Partner's Capital (in units)   5,245,000
Conversion of operating partnership units to ESRT Partner's Capital   $ 19,941
Equity compensation (in units)   46,000
Equity compensation   $ 355
Distributions   (39,491)
Net income   34,490
Change in unrealized gain (loss) on valuation of interest rate swap agreements   $ (13,744)
Ending balance (in units) 154,925,000 154,925,000
Ending balance $ 1,137,558 $ 1,137,558
Limited Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   93,863,000
Beginning balance   $ 809,901
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (2,225,000)
Conversion of operating partnership units to ESRT Partner's Capital   $ (18,687)
Equity compensation (in units)   1,869,000
Equity compensation   $ 6,899
Distributions   (27,814)
Net income   24,930
Change in unrealized gain (loss) on valuation of interest rate swap agreements   $ (9,935)
Ending balance (in units) 93,507,000 93,507,000
Ending balance $ 785,294 $ 785,294
Limited Partner | Series ES operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   38,262,000
Beginning balance   $ 22,074
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (2,201,000)
Conversion of operating partnership units to ESRT Partner's Capital   $ (960)
Distributions   (10,883)
Net income   10,075
Change in unrealized gain (loss) on valuation of interest rate swap agreements   $ (4,015)
Ending balance (in units) 36,061,000 36,061,000
Ending balance $ 16,291 $ 16,291
Limited Partner | Series 60 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   10,318,000
Beginning balance   $ 5,366
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (524,000)
Conversion of operating partnership units to ESRT Partner's Capital   $ (191)
Distributions   (2,967)
Net income   2,721
Change in unrealized gain (loss) on valuation of interest rate swap agreements   $ (1,084)
Ending balance (in units) 9,794,000 9,794,000
Ending balance $ 3,845 $ 3,845
Limited Partner | Series 250 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   5,106,000
Beginning balance   $ 2,612
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (295,000)
Conversion of operating partnership units to ESRT Partner's Capital   $ (103)
Distributions   (1,459)
Net income   1,324
Change in unrealized gain (loss) on valuation of interest rate swap agreements   $ (527)
Ending balance (in units) 4,811,000 4,811,000
Ending balance $ 1,847 $ 1,847
Private Perpetual Preferred Units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   1,560,000
Beginning balance   $ 8,004
Distributions   (702)
Net income   $ 702
Ending balance (in units) 1,560,000 1,560,000
Ending balance $ 8,004 $ 8,004