Warranties (Details Textual)	6 Months Ended
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Standard warranty for parts and services	1 year
Standard warranty for new railcars	5 years

Standard warranty period maximum for parts and services.

No definition available.

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Namespace Prefix:	arii_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration