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Related Party Transactions Excluded Properties and Businesses (Details) | Jun. 30, 2014 office_and_property
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Retail Site [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 4
Office Building [Member] |
Related Party Transaction [Line Items] |
Number of properties | 12
Office Building [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 7
Malkin Group [Member] | Mezzanine and Senior Equity Funds [Member] |
Related Party Transaction [Line Items] |
Number of interests owned | 6
Malkin Group [Member] | Industrial Funds [Member] |
Related Party Transaction [Line Items] |
Number of interests owned | 2
Malkin Group [Member] | Residential Property Manager [Member] |
Related Party Transaction [Line Items] |
Number of properties | 5
Number of interests owned | 5
Malkin Group [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 1
Malkin Group [Member] | Multi-family Property [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 6
Malkin Group [Member] | Retail Site [Member] | Greenwich, Connecticut [Member] |
Related Party Transaction [Line Items] |
Number of properties | 6
Malkin Group [Member] | Retail Site [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 2
Malkin Group [Member] | Office Building [Member] | Manhattan [Member] |
Related Party Transaction [Line Items] |
Number of properties | 1

X
- Definition Number of Interests Owned + References No definition available. + Details
Name: | esrop_NumberofInterestsOwned
Namespace Prefix: | esrop_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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