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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Series PR Operating Partnership Units [Member] | Dec. 31, 2013 Series PR Operating Partnership Units [Member] | Sep. 30, 2014 Series ES operating partnership units (45,581,117 and 46,134,135 limited partner operating partnership units outstanding in 2014 and 2013, respectively) | Dec. 31, 2013 Series ES operating partnership units (45,581,117 and 46,134,135 limited partner operating partnership units outstanding in 2014 and 2013, respectively) | Sep. 30, 2014 Series 60 Operating Partnership Units [Member] | Dec. 31, 2013 Series 60 Operating Partnership Units [Member] | Sep. 30, 2014 Series 250 operating partnership units (6,389,111 and 6,578,014 limited partner operating partnership units outstanding in 2014 and 2013, respectively) | Dec. 31, 2013 Series 250 operating partnership units (6,389,111 and 6,578,014 limited partner operating partnership units outstanding in 2014 and 2013, respectively) | Sep. 30, 2014 ESRT [Member] Series PR Operating Partnership Units [Member] | Dec. 31, 2013 ESRT [Member] Series PR Operating Partnership Units [Member]
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Tenant and other receivables allowance | $ 2,555 | $ 499 |  |  |  |  |  |  |  |  |  |
Deferred rent receivables allowance | $ 792 | $ 216 |  |  |  |  |  |  |  |  |  |
ESRT General Partner Operating Partnership Units Outstanding | 98,267,542 |  |  |  |  |  |  |  |  |  | 2,459,640 | 2,454,770
Limited partner operating partnership units, outstanding | 168,862,138 |  | 85,073,470 | 84,588,270 | 46,134,135 | 46,134,135 | 12,570,434 | 12,570,434 | 6,578,014 | 6,578,014 | 93,148,350 | 93,151,383

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