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Rental Income - Narrative (Details) | 9 Months Ended
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Sep. 30, 2017
Minimum |
Operating Leases [Line Items] |
Term of lease | 1 year
Maximum |
Operating Leases [Line Items] |
Term of lease | 16 years

X
- Definition [Line Items] for Operating Leases [Table] + References No definition available. + Details
Name: | esrt_OperatingLeasesLineItems
Namespace Prefix: | esrt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LessorLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |