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Supplementary Oil and Gas Information - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Prices crude oil 84.09aret_PricesCrudeOilPerBarrel 87.49aret_PricesCrudeOilPerBarrel
Prices natural gas 6.09aret_PricesNaturalGasPerMmbtu 5.86aret_PricesNaturalGasPerMmbtu
Annual discount rate 10.00%aret_AnnualDiscountRateForDiscountingFutureCashFlows  
Benchmark    
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Prices crude oil 94.99aret_PricesCrudeOilPerBarrel
/ us-gaap_StatementScenarioAxis
= aret_BenchmarkMember		 96.78aret_PricesCrudeOilPerBarrel
/ us-gaap_StatementScenarioAxis
= aret_BenchmarkMember
Prices natural gas 4.35aret_PricesNaturalGasPerMmbtu
/ us-gaap_StatementScenarioAxis
= aret_BenchmarkMember		 3.67aret_PricesNaturalGasPerMmbtu
/ us-gaap_StatementScenarioAxis
= aret_BenchmarkMember