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Real Estate Investments - Continuing Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Office [Member] | Dec. 31, 2011 Office [Member] | Dec. 31, 2012 Medical Office [Member] | Dec. 31, 2011 Medical Office [Member] | Dec. 31, 2012 Retail [Member] | Dec. 31, 2011 Retail [Member] | Dec. 31, 2012 Multifamily [Member] | Dec. 31, 2011 Multifamily [Member] | Dec. 31, 2012 Office [Member] | Dec. 31, 2011 Office [Member] | Dec. 31, 2012 Medical Office [Member] | Dec. 31, 2011 Medical Office [Member] | Dec. 31, 2012 Retail [Member] | Dec. 31, 2011 Retail [Member] | Dec. 31, 2012 Multifamily [Member] | Dec. 31, 2011 Multifamily [Member] | Dec. 31, 2012 4661 Kenmore Avenue [Member] | Dec. 31, 2011 Dulles Station II [Member] | Dec. 31, 2012 Dulles Station II [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate, adjusted | $ 2,529,131 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,810 | [1],[2] |  | $ 12,070 | [1],[2]
Real estate investment property, at cost | 2,462,546 |  | 2,364,885 |  |  |  |  |  |  |  |  |  | 1,315,633 | 1,234,499 | 403,064 | 396,532 | 411,948 | 408,897 | 331,901 | 324,957 |  |  |  |  |
Properties under development or held for future development | 49,135 |  | 43,089 |  | 8,977 | 8,953 | 3,810 | 5,758 | 587 | 576 | 35,761 | 27,802 |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate impairment | $ 2,097 |  | $ 14,526 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100 |  | $ 14,500 |  |
[1] | At December 31, 2012, total land, buildings and improvements are carried at $2,148,544,000 for federal income tax purposes.
[2] | As of December 31, 2012, WRIT had land held for development in Herndon, VA (Dulles Station, Phase II). WRIT also held a 0.8 acre parcel of land at 4661 Kenmore for future development. Additionally, WRIT had investments in various smaller development or redevelopment projects. The total land value not yet placed in service of these development projects at December 31, 2012 was $7.5 million. $0.5 million of Dulles Station, Phase II land was placed into service upon the completion of a portion of the parking garage structure.

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + 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 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Gross amount at which land and buildings and improvements are carried at the end of the period for each property. + 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 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 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 Amount of real estate investment property 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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