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Mortgages and Notes Receivable (Details) (USD $) |  |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |
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Mar. 31, 2013 acre | Dec. 31, 2012 | Mar. 31, 2013 Seller Financing [Member] transactions | Dec. 31, 2012 Seller Financing [Member] | Mar. 31, 2013 Mortgage Receivable [Member] | Dec. 31, 2012 Mortgage Receivable [Member] acre | Mar. 31, 2013 Promissory Notes [Member] | Mar. 31, 2012 Promissory Notes [Member] | Dec. 31, 2012 Promissory Notes [Member] | Mar. 31, 2013 Highwoods Realty Limited Partnership [Member] acre | Dec. 31, 2012 Highwoods Realty Limited Partnership [Member] | Mar. 31, 2013 Highwoods Realty Limited Partnership [Member] Seller Financing [Member] transactions | Dec. 31, 2012 Highwoods Realty Limited Partnership [Member] Seller Financing [Member] | Mar. 31, 2013 Highwoods Realty Limited Partnership [Member] Mortgage Receivable [Member] | Dec. 31, 2012 Highwoods Realty Limited Partnership [Member] Mortgage Receivable [Member] acre | Mar. 31, 2013 Highwoods Realty Limited Partnership [Member] Promissory Notes [Member] | Mar. 31, 2012 Highwoods Realty Limited Partnership [Member] Promissory Notes [Member] | Dec. 31, 2012 Highwoods Realty Limited Partnership [Member] Promissory Notes [Member]
Schedule of mortgages and notes receivable [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, gross |  |  | $ 15,853,000 | $ 15,853,000 | $ 8,648,000 | $ 8,648,000 | $ 1,408,000 |  | $ 1,153,000 |  |  | $ 15,853,000 | $ 15,853,000 | $ 8,648,000 | $ 8,648,000 | $ 1,408,000 |  | $ 1,153,000
Mortgages and notes receivable, allowance | (437,000) | (182,000) | 0 |  | 0 | 0 | (437,000) | (122,000) |  | (437,000) | (182,000) | 0 |  | 0 | 0 | (437,000) | (122,000) |
Mortgages and notes receivable, net | 25,472,000 | 25,472,000 | 15,853,000 | 15,853,000 | 8,648,000 | 8,648,000 | 971,000 |  | 971,000 | 25,472,000 | 25,472,000 | 15,853,000 | 15,853,000 | 8,648,000 | 8,648,000 | 971,000 |  | 971,000
Financing receivable, gross |  |  | 15,853,000 | 15,853,000 | 8,648,000 | 8,648,000 | 1,408,000 |  | 1,153,000 |  |  | 15,853,000 | 15,853,000 | 8,648,000 | 8,648,000 | 1,408,000 |  | 1,153,000
Number of transactions with seller financing |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Acquisition of development land (in acres) |  |  |  |  |  | 77 |  |  |  |  |  |  |  |  | 77 |  |  |
Acquisition development land (in acres) | 649 |  |  |  |  | 68 |  |  |  | 649 |  |  |  |  | 68 |  |  |
Mortgage receivable maturity date |  |  |  |  |  | Dec. 01, 2015 |  |  |  |  |  |  |  |  | Dec. 01, 2015 |  |  |
Mortgage receivable current interest rate (in hundredths) |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |
Term of optional extension |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  | 3 years |  |  |
Additional loan commitment to third party |  |  |  |  |  | 8,400,000 |  |  |  |  |  |  |  |  | 8,400,000 |  |  |
Cumulative funds for future infrastructure disbursed to third party |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Notes receivable allowance, promissory notes [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning notes receivable allowance | (437,000) | (182,000) | 0 |  | 0 |  | (182,000) | (61,000) |  | (437,000) | (182,000) | 0 |  | 0 |  | (182,000) | (61,000) |
Recoveries/write-offs/other |  |  |  |  |  |  | 255,000 | 61,000 |  |  |  |  |  |  |  | 255,000 | 61,000 |
Total notes receivable allowance | $ (437,000) | $ (182,000) | $ 0 |  | $ 0 | $ 0 | $ (437,000) | $ (122,000) |  | $ (437,000) | $ (182,000) | $ 0 |  | $ 0 | $ 0 | $ (437,000) | $ (122,000) |

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- Definition Date when the loan receivable is scheduled to be fully repaid, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -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 3 -Article 5 + Details
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