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Related Party Transactions Reimbursement of Pre-Closing Transaction Costs (Details) (Pre-Closing Transaction Costs [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Investor [Member] |
Related Party Transaction [Line Items] |
Expenses from transactions with related party | $ 103.8 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = esrt_PreClosingTransactionCostsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_InvestorMember
Senior Management and Certain Directors [Member] |
Related Party Transaction [Line Items] |
Expenses from transactions with related party | 180.0 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = esrt_PreClosingTransactionCostsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_SeniorManagementandCertainDirectorsMember
Malkin Group [Member] |
Related Party Transaction [Line Items] |
Expenses from transactions with related party | $ 38.9 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = esrt_PreClosingTransactionCostsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=esrt_MalkinGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=esrt_SeniorManagementandCertainDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_InvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |