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Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Jan. 09, 2013 ATM 2012 Equity Sales Offering [Member] | Jan. 09, 2013 Greensboro, NC Office Properties Acquisition (2012) [Member] sqft property | Dec. 31, 2012 Highwoods Realty Limited Partnership [Member] | Dec. 31, 2011 Highwoods Realty Limited Partnership [Member] | Jan. 09, 2013 Highwoods Realty Limited Partnership [Member] ATM 2012 Equity Sales Offering [Member] | Jan. 09, 2013 Highwoods Realty Limited Partnership [Member] Greensboro, NC Office Properties Acquisition (2012) [Member] property sqft
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of Common Stock sold at the market (in shares) | 7,245,837 | 378,200 | 198,177 |  | 7,245,837 | 378,200 | 198,177 |
Average price of Common Stock sold at the market | $ 33.12 | $ 35.09 | $ 33.97 |  | $ 33.12 | $ 35.09 | $ 33.97 |
Net proceeds of Common Stock sold at the market | $ 236.4 | $ 13.1 | $ 6.6 |  | $ 236.4 | $ 13.1 | $ 6.6 |
Number of office properties acquired |  |  |  | 2 |  |  |  | 2
Net rentable square feet of acquisition (in sqft) |  |  |  | 195,000 |  |  |  | 195,000
Acquisition purchase price |  |  |  | 30.9 |  |  |  | 30.9
Acquisition-related costs | $ 1.5 |  |  | $ 0.2 | $ 1.5 |  |  | $ 0.2

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- Definition The net proceeds of Common Stock sold "at the market" during the period. + References No definition available. + Details
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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -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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