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Capital - Earnings Per Unit (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	630,843us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	505,138us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Numerator:
Net income	$ 7,888us-gaap_ProfitLoss	$ 11,231us-gaap_ProfitLoss
Private perpetual preferred unit distributions	(234)us-gaap_PreferredStockDividendsAndOtherAdjustments	0us-gaap_PreferredStockDividendsAndOtherAdjustments
Earnings allocated to unvested units	(144)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	(122)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income attributable to common unitholders - basic and diluted	$ 7,510esrt_NetIncomeLossExcludingPortionAttributabletoNoncontrollingInterestandParticipatingSecuritiesBasicandDiluted	$ 11,109esrt_NetIncomeLossExcludingPortionAttributabletoNoncontrollingInterestandParticipatingSecuritiesBasicandDiluted
Denominator:
Weighted average units outstanding - basic and diluted	265,810,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	244,425,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Earnings per unit - basic and diluted	$ 0.03us-gaap_EarningsPerShareBasicAndDiluted	$ 0.05us-gaap_EarningsPerShareBasicAndDiluted

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Net Income Loss Excluding Portion Attributable to Noncontrolling Interest and Participating Securities Basic and Diluted

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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