BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
BENEFIT PLANS
Age of employees to be eligible to participate in the defined contribution plan	21 years
Eligible service period to participate in the defined contribution plan	1 year
Matching contribution by the company (as a percent)	50.00%
Maximum percentage of employee's salary	2.00%
Total matching contributions	$ 0.1	$ 0.1
Maximum potential obligation for proposed correction	$ 0.1

Represents the age of employees to be eligible to participate in the defined contribution plan.

No definition available.

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Namespace Prefix:	adk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the service period served by the employee to be eligible to participate in the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	adk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The employer matching percentage of a specified percentage of an employee's gross pay for which the employer contributes to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	adk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum potential obligation for a proposed correction relating to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	adk_DefinedContributionPlanPotentialMaximumObligation
Namespace Prefix:	adk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-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

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration