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v3.20.4

Related Party Transactions - Other (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) ft² property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |
Area of real estate property (in sqft) | 10,100,000 |  |
Undivided Interest |  |  |
Related Party Transaction [Line Items] |  |  |
Area of real estate property (in sqft) | 5,447 |  |
Chairman emeritus | Leased space rental |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties | property | 1 |  |
Lease cancellation, period of notice (in days) | 90 days |  |
Percentage of lease space occupied by Chairman emeritus and employee | 15.00% |  |
Revenue from related parties, net of payment for pro rata share of leased space | $ | $ 0.3 | $ 0.3 | $ 0.3

X
- Definition Lease Cancellation, Period of Notice + References No definition available. + Details
Name: | esrt_LeaseCancellationPeriodofNotice
Namespace Prefix: | esrt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Percentage of Leased Space Occupied + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionPercentageofLeasedSpaceOccupied
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue from Related Parties, Net of Payment for Allocable Pro Rata Leased Share + References No definition available. + Details
Name: | esrt_RevenuefromRelatedPartiesNetofPaymentforAllocableProRataLeasedShare
Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_UndividedInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=esrt_BoardofDirectorsChairmanEmeritusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=esrt_LeasedSpaceRentalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |