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Summary of Significant Accounting Policies Narrative (Details) | Mar. 31, 2015
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Minimum [Member] |
Accounting Policies [Line Items] |
Percent of observatory revenue in quarter one over a ten year period | 16.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterOneOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Percent of observatory revenue in quarter two over a ten year period | 26.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterTwoOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Percent of observatory revenue in quarter three over a ten year period | 31.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterThreeOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Percent of observatory revenue in quarter four over a ten year period | 23.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterFourOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |
Accounting Policies [Line Items] |
Percent of observatory revenue in quarter one over a ten year period | 18.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterOneOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MaximumMember
Percent of observatory revenue in quarter two over a ten year period | 28.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterTwoOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MaximumMember
Percent of observatory revenue in quarter three over a ten year period | 33.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterThreeOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MaximumMember
Percent of observatory revenue in quarter four over a ten year period | 25.00%esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterFourOverTenYearPeriodPercent / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Details
Name: | esrt_AccountingPoliciesLineItems
Namespace Prefix: | esrt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Historical Revenue Trend, Observatory Revenue, in Quarter Four Over Ten Year Period, Percent + References No definition available. + Details
Name: | esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterFourOverTenYearPeriodPercent
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Historical Revenue Trend, Observatory Revenue, in Quarter One Over Ten Year Period, Percent + References No definition available. + Details
Name: | esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterOneOverTenYearPeriodPercent
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Historical Revenue Trend, Observatory Revenue, in Quarter Three Over Ten Year Period, Percent + References No definition available. + Details
Name: | esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterThreeOverTenYearPeriodPercent
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Historical Revenue Trend, Observatory Revenue, in Quarter Two Over Ten Year Period, Percent + References No definition available. + Details
Name: | esrt_HistoricalRevenueTrendObservatoryRevenueinQuarterTwoOverTenYearPeriodPercent
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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