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Acquisitions - Acquisition Income from Acquisition Date (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Business Combinations [Abstract]  
Total revenues $ 20,219us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Operating expenses 21,365esrt_BusinessCombinationProFormaInformationOperatingExpensesofAcquireesinceAcquisitionDateActual
Operating loss (1,146)esrt_BusinessCombinationProFormaInformationOperatingIncomeLossofAcquireesinceAcquisitionDateActual
Net loss $ (2,450)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual