Employee Benefit Plans (Details Textual)	Sep. 30, 2017 plan
Compensation and Retirement Disclosure [Abstract]
Number of total defined benefit plans	3
Number of repair pension plans	2

Number of total defined benefit plans the company sponsors

No definition available.

Name:	arii_NumberOfTotalDefinedBenefitPlans
Namespace Prefix:	arii_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant