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Real Estate Investments - Noncontrolling Interests in Subsidiaries and VIEs (Details) (USD $) | 12 Months Ended |  | 6 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 31, 2007 4661 Kenmore Avenue [Member] acre | Jun. 30, 2011 Six Fifty North Glebe Road [Member] | Dec. 31, 2012 Six Fifty North Glebe Road [Member] | Dec. 31, 2011 Six Fifty North Glebe Road [Member] | Nov. 30, 2011 1225 First Street [Member] | Dec. 31, 2012 1225 First Street [Member] | Dec. 31, 2011 1225 First Street [Member] | Oct. 31, 2011 Northern Virginia Industrial Park I I Member | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Land, Acres Held |  |  |  | 0.8 |  |  |  |  |  |  |  |  |
Gain on sale of properties | $ 5,124,000 | $ 97,491,000 | $ 21,599,000 |  |  |  |  |  |  |  | $ 400,000 |  |
Estimated development costs |  |  |  |  | 49,500,000 |  |  | 95,300,000 |  |  |  |  |
Percentage of capital contribution through debt | 70.00% |  |  |  | 70.00% |  |  | 70.00% |  |  |  |  |
Ownership percentage |  |  |  |  | 90.00% |  |  | 95.00% |  |  |  | 90.00% | 95.00%
Percentage Of residential property to be leased to achieve project stabilization stage |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  | 10.00% |  |  | 5.00% |  |  |  |  |
Land and capitalized development costs |  |  |  |  |  | 15,646,000 | 13,406,000 |  | 19,807,000 | 14,396,000 |  |  |
Accounts payable and accrued liabilities | $ 52,823,000 | $ 51,079,000 |  |  |  | $ 115,000 | $ 47,000 |  | $ 1,676,000 | $ 235,000 |  |  |

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 1, 5 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 7 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities.. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 67 -Paragraph 4, 5, 6, 7 -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 Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 + Details
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