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Investments in and Loans to Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Carrying amount of investments in and loans to joint ventures    
Investment in and loans to joint ventures $ 29,168us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 31,430us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Ohio Castings [Member]    
Carrying amount of investments in and loans to joint ventures    
Investment in and loans to joint ventures 9,194us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember		 7,378us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_OhioCastingsMember
Axis [Member]    
Carrying amount of investments in and loans to joint ventures    
Investment in and loans to joint ventures $ 19,974us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember		 $ 24,052us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arii_AxisMember