XML 56 R44.htm IDEA: XBRL DOCUMENT v2.4.1.9
Investments in Non-controlled Entities Schedule of Equity Method Investments (Details)
 0 Months Ended
Oct. 06, 2013
entity
Schedule of Equity Method Investments [Line Items]  
Number of entities acquired 4us-gaap_NumberOfBusinessesAcquired
Empire State Building, L.L.C. [Member]  
Schedule of Equity Method Investments [Line Items]  
Ownership percentage 23.75%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= esrt_EmpireStateBuildingL.L.C.Member
1333 Broadway Associates [Member]  
Schedule of Equity Method Investments [Line Items]  
Ownership percentage 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= esrt_Location1333BroadwayAssociatesMember
1350 Broadway Associates [Member]  
Schedule of Equity Method Investments [Line Items]  
Ownership percentage 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= esrt_Location1350BroadwayAssociatesMember
501 Seventh Avenue Associates [Member]  
Schedule of Equity Method Investments [Line Items]  
Ownership percentage 20.469%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= esrt_Location501SeventhAvenueAssociatesMember