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Acquisitions - Schedule of pro forma information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Business Combinations [Abstract] |
Total revenues | $ 157,692 us-gaap_BusinessAcquisitionsProFormaRevenue
Net income | $ 9,197 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per unit - basic and diluted | $ 0.03 esrt_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted

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- Definition Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a 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)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration