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Rental Income (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2012
Weighted Average Remaining Lease Term | 12 years 1 month 6 days
Walgreens Co [Member] |
Percentage Of Future Minimum Rentals Income | 38.60%
Kmart Corporation [Member] |
Percentage Of Future Minimum Rentals Income | 1.30%
Cvs Caremark Corporation [Member] |
Percentage Of Future Minimum Rentals Income | 9.70%
Minimum [Member] |
Lease Agreement Term | 5 years
Maximum [Member] |
Lease Agreement Term | 25 years

X
- Definition The period of lease agreement. + References No definition available. + Details
Name: | adc_LeaseAgreementTerm
Namespace Prefix: | adc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of minimum rentals income from leases. + References No definition available. + Details
Name: | adc_PercentageOfFutureMinimumRentalsIncome
Namespace Prefix: | adc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average period of lease agreement. + References No definition available. + Details
Name: | adc_WeightedAverageRemainingLeaseTerm
Namespace Prefix: | adc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration