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Investments in and Loans to Joint Ventures (Details Textual) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
joint_venture
Dec. 31, 2013
Dec. 31, 2012
Dec. 27, 2013
Investments in and Loans to Joint Ventures (Textual) [Abstract]        
Number of joint ventures 2arii_NumberOfJointVentures      
Contributions made $ 0us-gaap_PaymentsToAcquireInterestInJointVenture $ 136,000us-gaap_PaymentsToAcquireInterestInJointVenture $ 1,856,000us-gaap_PaymentsToAcquireInterestInJointVenture  
Income (Loss) from Equity Method Investments 1,570,000us-gaap_IncomeLossFromEquityMethodInvestments (8,595,000)us-gaap_IncomeLossFromEquityMethodInvestments (451,000)us-gaap_IncomeLossFromEquityMethodInvestments  
Axis Credit Agreement [Member]        
Investments in and Loans to Joint Ventures (Textual) [Abstract]        
Interest rate 7.75%us-gaap_RelatedPartyTransactionRate
/ us-gaap_DebtInstrumentAxis
= arii_AxisCreditAgreementMember
     
Balance outstanding on loans 29,100,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= arii_AxisCreditAgreementMember
32,900,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= arii_AxisCreditAgreementMember
   
Ohio Castings [Member]        
Investments in and Loans to Joint Ventures (Textual) [Abstract]        
Percentage of interest held in joint venture 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember
     
Equity Method Investment, Net Income (Loss) 5,906,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember
1,115,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember
3,627,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember
 
Axis [Member]        
Investments in and Loans to Joint Ventures (Textual) [Abstract]        
Percentage of interest held in joint venture 41.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
     
Minority Partnership In Joint Venture 9.70%arii_MinorityPartnerOwnershipinJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
     
Other Significant Partnership In Joint Venture 48.40%arii_OtherSignificantPartnerOwnershipinJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
     
Equity Method Investment, Net Income (Loss) (390,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
(652,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
(1,345,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember
 
Amtek Railcar [Member]        
Investments in and Loans to Joint Ventures (Textual) [Abstract]        
Percentage of interest held in joint venture       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
Equity Method Investment, Realized Gain (Loss) on Disposal       5,900,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
Income (Loss) from Equity Method Investments   2,800,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
1,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
 
Equity Method Investment, Realized Loss on Disposal   8,700,000arii_IncomeLossfromEquityMethodInvestmentsandRealizedGainLossonDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
   
Equity Method Investment, Net Income (Loss)   $ (5,600,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember
$ (2,100,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AmtekRailcarMember