Quarterly report pursuant to Section 13 or 15(d)

Real Estate Acquisitions And Discontinued Operations (Acquisition Of Properties And Land For Development During 2011) (Details)

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Real Estate Acquisitions And Discontinued Operations (Acquisition Of Properties And Land For Development During 2011) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
sqft
Sep. 30, 2010
Dec. 31, 2010
Real Estate Properties [Line Items]      
Property Type Total 2011 Total 2010  
Rental Square Feet 1,081,000    
Contract purchase price $ 371,600,000    
Real estate investment property, at cost 2,397,338,000   2,051,936,000
1140 Connecticut Avenue [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date January 11, 2011    
Property Type Office    
Rental Square Feet 184,000    
1140 Connecticut Avenue [Member] | Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 80,250,000    
1227 25th Street [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date March 30, 2011    
Property Type Office    
Rental Square Feet 130,000    
1227 25th Street [Member] | Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 47,000,000    
650 North Glebe Road [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date June 15, 2011 [1]    
Property Type Multifamily [1]    
Rental Square Feet 37,000    
WRIT's equity interest in Joint Venture 90.00%    
Property Acquired [Member] | 650 North Glebe Road [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 11,800,000 [1]    
Olney Village Center [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date August 30, 2011    
Property Type Retail    
Rental Square Feet 199,000    
Olney Village Center [Member] | Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 58,000,000    
Braddock Metro Center [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date September 13, 2011    
Property Type Office    
Rental Square Feet 345,000    
Braddock Metro Center [Member] | Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 101,000,000    
John Marshall II [Member]
     
Real Estate Properties [Line Items]      
Acquisition Date September 15, 2011    
Property Type Office    
Rental Square Feet 223,000    
John Marshall II [Member] | Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost 73,500,000    
Property Acquired [Member]
     
Real Estate Properties [Line Items]      
Real estate investment property, at cost $ 371,550,000    
[1] 650 North Glebe Road is 37,000 square feet of land acquired by a consolidated joint venture for the purpose of developing an apartment community. WRIT is a 90% owner of joint venturethe .