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Recently Adopted Accounting Standards (Details) (Fresenius Medical Center Green OH, USD $)
0 Months Ended 12 Months Ended
Dec. 03, 2014
Dec. 03, 2015
Recently Adopted Accounting Standards (Details) [Line Items]    
Payments to Acquire Real Estate $ 2,360,000us-gaap_PaymentsToAcquireRealEstate  
Business Acquisition, Transaction Costs 83,428us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts  
Average Lease Term 10.2 years  
Real Estate Revenue, Net   163,184us-gaap_RealEstateRevenueNet
Leases, Acquired-in-Place [Member]
   
Recently Adopted Accounting Standards (Details) [Line Items]    
Finite-Lived Intangible Asset, Acquired-in-Place Leases $ 242,949us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
/ us-gaap_BusinessAcquisitionAxis
= aei20_FreseniusMedicalCenterGreenOHMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember