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Real Estate Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended
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Sep. 30, 2012 property | Sep. 30, 2011 | Sep. 30, 2012 property | Sep. 30, 2011 | Sep. 30, 2012 Atlanta, GA Office Property Acquisition (2012) [Member] sqft | Sep. 30, 2012 Greensboro, NC Medical Office Properties Acquisition [Member] property | Sep. 30, 2011 Pittsburgh PA Office Property Acquisition [Member] property sqft | Sep. 30, 2011 Atlanta GA Office Property Acquisition [Member] sqft | Jun. 30, 2012 Cary, NC Office Property Acquisition [Member] sqft | Sep. 30, 2012 Kansas City, MO Office Property Disposition (2012) [Member] | Sep. 30, 2012 Nashville, TN Office Properties Disposition [Member] property | Sep. 30, 2012 Atlanta, GA and Jackson, MS Office Properties Disposition [Member] property | Mar. 31, 2012 Kansas City, MO Rental Residential Disposition [Member] properties | Jun. 30, 2012 Pinellas County, FL Office Property Disposition [Member] | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] property | Sep. 30, 2011 Highwoods Realty Limited Partnership [Member] | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] property | Sep. 30, 2011 Highwoods Realty Limited Partnership [Member] | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] Atlanta, GA Office Property Acquisition (2012) [Member] sqft | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] Greensboro, NC Medical Office Properties Acquisition [Member] property | Sep. 30, 2011 Highwoods Realty Limited Partnership [Member] Pittsburgh PA Office Property Acquisition [Member] sqft property | Sep. 30, 2011 Highwoods Realty Limited Partnership [Member] Atlanta GA Office Property Acquisition [Member] sqft | Jun. 30, 2012 Highwoods Realty Limited Partnership [Member] Cary, NC Office Property Acquisition [Member] sqft | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] Kansas City, MO Office Property Disposition (2012) [Member] | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] Nashville, TN Office Properties Disposition [Member] property | Sep. 30, 2012 Highwoods Realty Limited Partnership [Member] Atlanta, GA and Jackson, MS Office Properties Disposition [Member] property | Mar. 31, 2012 Highwoods Realty Limited Partnership [Member] Kansas City, MO Rental Residential Disposition [Member] properties | Jun. 30, 2012 Highwoods Realty Limited Partnership [Member] Pinellas County, FL Office Property Disposition [Member]
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of office properties acquired | 3 |  | 3 |  |  | 2 | 6 |  |  |  |  |  |  |  | 3 |  | 3 |  |  | 2 | 6 |  |  |  |  |  |  |
Rentable square feet of acquisition (in sq. ft) |  |  |  |  | 492,000 |  | 1,540,000 | 503,000 | 178,300 |  |  |  |  |  |  |  |  |  | 492,000 |  | 1,540,000 | 503,000 | 178,300 |  |  |  |  |
Acquisition purchase price | $ 161,200,000 |  | $ 161,200,000 |  | $ 144,900,000 | $ 16,300,000 | $ 188,500,000 | $ 78,300,000 | $ 26,000,000 |  |  |  |  |  | $ 161,200,000 |  | $ 161,200,000 |  | $ 144,900,000 | $ 16,300,000 | $ 188,500,000 | $ 78,300,000 | $ 26,000,000 |  |  |  |  |
Common Units issued to acquire real estate assets (in shares) | 66,864 |  | 66,864 |  |  | 66,864 |  |  |  |  |  |  |  |  | 66,864 |  | 66,864 |  |  | 66,864 |  |  |  |  |  |  |  |
Contingent consideration at fair value | 563,000 |  | 563,000 |  |  | 700,000 |  |  |  |  |  |  |  |  | 563,000 |  | 563,000 |  |  | 700,000 |  |  |  |  |  |  |  |
Acquisition-related costs | 700,000 |  |  |  | 540,000 | 113,000 |  |  |  |  |  |  |  |  | 700,000 |  |  |  | 500,000 | 100,000 |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate assets | 135,128,000 |  | 135,128,000 |  |  |  |  |  |  |  |  |  |  |  | 135,128,000 |  | 135,128,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition-related intangible assets (in deferred financing and leasing costs) | 21,637,000 |  | 21,637,000 |  |  |  |  |  |  |  |  |  |  |  | 21,637,000 |  | 21,637,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition-related below market lease liabilities (in accounts payable, accrued expenses and other liabilities) | (11,875,000) |  | (11,875,000) |  |  |  |  |  |  |  |  |  |  |  | (11,875,000) |  | (11,875,000) |  |  |  |  |  |  |  |  |  |  |
Total allocation | 144,890,000 |  | 144,890,000 |  |  |  |  |  |  |  |  |  |  |  | 144,890,000 |  | 144,890,000 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma rental and other revenues | 132,632,000 | 132,269,000 | 395,161,000 | 385,246,000 |  |  |  |  |  |  |  |  |  |  | 132,632,000 | 132,269,000 | 395,161,000 | 385,246,000 |  |  |  |  |  |  |  |  |  |
Pro forma net income | 35,765,000 | 7,626,000 | 68,526,000 | 33,268,000 |  |  |  |  |  |  |  |  |  |  | 35,769,000 | 7,626,000 | 68,535,000 | 33,280,000 |  |  |  |  |  |  |  |  |  |
Pro forma earnings per share - basic | $ 0.43 | $ 0.09 | $ 0.84 | $ 0.35 |  |  |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.09 | $ 0.85 | $ 0.36 |  |  |  |  |  |  |  |  |  |
Pro forma earnings per share - diluted | $ 0.43 | $ 0.09 | $ 0.84 | $ 0.35 |  |  |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.09 | $ 0.85 | $ 0.36 |  |  |  |  |  |  |  |  |  |
Pro forma, assumption date of acquisition |  |  |  |  | Jan. 01, 2011 |  | Jan. 01, 2010 | Jan. 01, 2010 |  |  |  |  |  |  |  |  |  |  | Jan. 01, 2011 |  | Jan. 01, 2010 | Jan. 01, 2010 |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rental residential units |  |  |  |  |  |  |  |  |  |  |  |  | 96 |  |  |  |  |  |  |  |  |  |  |  |  |  | 96 |
Number of office properties sold |  |  |  |  |  |  |  |  |  |  | 5 | 3 |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 3 |  |
Gross proceeds from the sale of real estate |  |  |  |  |  |  |  |  |  | 6,500,000 | 41,000,000 | 86,500,000 | 11,000,000 | 9,500,000 |  |  |  |  |  |  |  |  |  | 6,500,000 | 41,000,000 | 86,500,000 | 11,000,000 | 9,500,000
Gains on disposition of discontinued operations | $ 22,936,000 | $ 2,573,000 | $ 29,455,000 | $ 2,573,000 |  |  |  |  |  | $ 1,900,000 | $ 7,000,000 | $ 14,000,000 | $ 5,100,000 | $ 1,400,000 | $ 22,936,000 | $ 2,573,000 | $ 29,455,000 | $ 2,573,000 |  |  |  |  |  | $ 1,900,000 | $ 7,000,000 | $ 14,000,000 | $ 5,100,000 | $ 1,400,000

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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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