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Commitments and Contingencies Unfunded Capital Expenditures (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014
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Commitments and Contingencies Disclosure [Abstract] |
Unfunded capital expenditures | $ 60.8

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- Definition Unfunded Capital Expenditures + References No definition available. + Details
Name: | esrop_UnfundedCapitalExpenditures
Namespace Prefix: | esrop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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