v3.5.0.2

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Outstanding borrowings	$ 275.0	$ 275.0	$ 273.0
Contractual settlement	$ 1.4	$ 1.4

X

- Definition

Contractual settlement.

+ References

No definition available.

+ Details

Name:	arex_ContractualSettlement
Namespace Prefix:	arex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line of credit facility gross amount borrowed.

+ References

No definition available.

+ Details

Name:	arex_LineOfCreditFacilityGrossAmountBorrowed
Namespace Prefix:	arex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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