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Discontinued Operations (Detail) - property	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Number of Properties Classified As Discontinued Operations	0	0

X

- Definition

The number of properties classified as discontinued operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	adc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration