Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.1.9
Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
units
Feb. 06, 2015
units
Subsequent Event [Line Items]    
Units 3,053us-gaap_NumberOfUnitsInRealEstateProperty  
Country Club Towers [Member]    
Subsequent Event [Line Items]    
Units 227us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_CountryClubTowersMember
 
Multifamily [Member] | Country Club Towers [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Units   227us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_CountryClubTowersMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Disposal Group, Not Discontinued Operation, Sale Price   $ 37.8wre_DisposalGroupNotDiscontinuedOperationSalePrice
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= wre_MultifamilyMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= wre_CountryClubTowersMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember