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Acquisitions Acquisition Income from Acquisition Date (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014
Business Combinations [Abstract] |  |  |
Total revenues | $ 76,989 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | $ 392,615 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |
Operating expenses | 27,562 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual |  | 91,387 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Operating income | 48,538 esrt_BusinessCombinationProFormaInformationOperatingExpensesofAcquireesinceAcquisitionDateActual | 289,433 esrt_BusinessCombinationProFormaInformationOperatingExpensesofAcquireesinceAcquisitionDateActual |
Net income | $ 28,451 esrt_BusinessCombinationProFormaInformationOperatingIncomeofAcquireesinceAcquisitionDateActual | $ 103,182 esrt_BusinessCombinationProFormaInformationOperatingIncomeofAcquireesinceAcquisitionDateActual |

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- Definition Business Combination, Pro Forma Information, Operating Expenses of Acquiree since Acquisition Date, Actual + References No definition available. + Details
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- Definition Business Combination, Pro Forma Information, Operating Income of Acquiree since Acquisition Date, Actual + References No definition available. + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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