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Schedule III - Real Estate and Accumulated Depreciation (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Balance at January 1 | $ 476,168,824 us-gaap_RealEstateGrossAtCarryingValue | $ 398,811,830 us-gaap_RealEstateGrossAtCarryingValue | $ 340,073,911 us-gaap_RealEstateGrossAtCarryingValue
Construction and acquisition cost | 143,365,974 adc_RealEstateConstructionAndAcquisitionCost | 82,692,554 adc_RealEstateConstructionAndAcquisitionCost | 97,418,031 adc_RealEstateConstructionAndAcquisitionCost
Impairment charge | 3,020,000 us-gaap_ImpairmentOfRealEstate | 450,000 us-gaap_ImpairmentOfRealEstate | 0 us-gaap_ImpairmentOfRealEstate
Disposition of real estate | (27,367,786)us-gaap_RealEstateCostOfRealEstateSold | (4,885,560)us-gaap_RealEstateCostOfRealEstateSold | (38,680,112)us-gaap_RealEstateCostOfRealEstateSold
Balance at December 31 | $ 589,147,012 us-gaap_RealEstateGrossAtCarryingValue | $ 476,168,824 us-gaap_RealEstateGrossAtCarryingValue | $ 398,811,830 us-gaap_RealEstateGrossAtCarryingValue

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- Definition Amount of real estate construction and acquisition cost incurred during the period. + References No definition available. + 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=31042434&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 + Details
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- Details
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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + 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=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + 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=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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