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Condensed Consolidated Statements of Capital - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance   $ 1,372,686
Equity compensation   4,646
Distributions   (51,673)
Net income $ 24,640 41,345
Change in unrealized loss on valuation of interest rate swap agreements (10,864) (30,235)
Ending balance $ 1,336,769 $ 1,336,769
General Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   120,023
Beginning balance   $ 524,729
Conversion of operating partnership units to ESRT Partner's Capital (in units)   3,811
Conversion of operating partnership units to ESRT Partner's Capital   $ 15,073
Equity compensation (in units)   47
Equity compensation   $ 225
Distributions   (23,253)
Net income   18,517
Change in unrealized loss on valuation of interest rate swap agreements   $ (13,695)
Ending balance (in units) 123,881 123,881
Ending balance $ 521,596 $ 521,596
Limited Partner | Series PR operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   93,863
Beginning balance   $ 809,901
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (1,665)
Conversion of operating partnership units to ESRT Partner's Capital   $ (14,075)
Equity compensation (in units)   1,869
Equity compensation   $ 4,421
Distributions   (17,977)
Net income   14,338
Change in unrealized loss on valuation of interest rate swap agreements   $ (10,605)
Ending balance (in units) 94,067 94,067
Ending balance $ 786,003 $ 786,003
Limited Partner | Series ES operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   38,262
Beginning balance   $ 22,074
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (1,635)
Conversion of operating partnership units to ESRT Partner's Capital   $ (783)
Distributions   (7,091)
Net income   5,711
Change in unrealized loss on valuation of interest rate swap agreements   $ (4,226)
Ending balance (in units) 36,627 36,627
Ending balance $ 15,685 $ 15,685
Limited Partner | Series 60 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   10,318
Beginning balance   $ 5,366
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (342)
Conversion of operating partnership units to ESRT Partner's Capital   $ (144)
Distributions   (1,932)
Net income   1,547
Change in unrealized loss on valuation of interest rate swap agreements   $ (1,144)
Ending balance (in units) 9,976 9,976
Ending balance $ 3,693 $ 3,693
Limited Partner | Series 250 operating partnership units    
Increase (Decrease) in Partners' Capital [Roll Forward]    
Beginning balance (in units)   5,106
Beginning balance   $ 2,612
Conversion of operating partnership units to ESRT Partner's Capital (in units)   (169)
Conversion of operating partnership units to ESRT Partner's Capital   $ (71)
Distributions   (952)
Net income   764
Change in unrealized loss on valuation of interest rate swap agreements   $ (565)
Ending balance (in units) 4,937 4,937
Ending balance $ 1,788 $ 1,788
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