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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 .

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- Definition Date property was acquired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 + Details
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- Definition This description includes the geographical location and the type of property (unimproved land, parking garage, shopping center, garden apartment, retail outlet, multi-tenant commercial), and may include the name of the property (such as ABC Shopping Center). An amount not exceeding five percent of the total carrying amount of all real estate investments may be described as miscellaneous investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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