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Deferred Costs, Acquired Lease Intangibles and Goodwill - Future Amortization Expense and Rental Revenue (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Future Amortization Expense [Abstract] |  |
Future Amortization Expense | $ 290,248 us-gaap_FiniteLivedIntangibleAssetsNet | $ 249,983 us-gaap_FiniteLivedIntangibleAssetsNet
Future Rental Revenue [Abstract] |  |
2015 | 19,687 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeNextTwelveMonths |
2016 | 9,166 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeYearTwo |
2017 | 5,656 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeYearThree |
2018 | 6,337 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeYearFour |
2019 | 6,591 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeYearFive |
Thereafter | 22,551 esrt_AboveandBelowMarketLeaseNetAmortizationIncomeafterYearFive |
Future Rental Revenue | 69,988 esrt_AboveandBelowMarketLeaseNet |
Lease Agreements [Member] |  |
Future Amortization Expense [Abstract] |  |
2015 | 47,217 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
2016 | 33,131 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
2017 | 25,576 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
2018 | 19,539 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
2019 | 16,736 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
Thereafter | 79,177 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
Future Amortization Expense | 221,376 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
Ground Lease [Member] |  |
Future Amortization Expense [Abstract] |  |
2015 | 7,831 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
2016 | 7,831 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
2017 | 7,831 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
2018 | 7,831 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
2019 | 7,831 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
Thereafter | 352,732 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |
Future Amortization Expense | $ 391,887 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_GroundLeaseMember |

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