v3.8.0.1

Summary of Significant Accounting Policies - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory Assets [Abstract] |  |
Capital expenditures accrual | $ 1,522 | $ 1,067
Operating expenses and other | 6,551 | 6,750
Total | $ 8,073 | $ 7,817

X
- Definition The sum of accrued capitalized costs relating to oil and gas producing activities. + References No definition available. + Details
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Namespace Prefix: | arex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The sum of all accrued operating expenses and other cost related to business activities. + References No definition available. + Details
Name: | arex_OperatingExpenseAndOtherAccruals
Namespace Prefix: | arex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Regulatory assets. + References No definition available. + Details
Name: | arex_RegulatoryAssetsAbstract
Namespace Prefix: | arex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant