Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearFive
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of future operating lease payments receivable within the fourth fiscal year following the current fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearFour
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of future operating lease payments receivable within the first fiscal year following the current fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearOne
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of future operating lease payments receivable after the fifth fiscal year following the current fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearSixAndBeyond
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of future operating lease payments receivable within the third fiscal year following the current fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearThree
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of future operating lease payments receivable within the second fiscal year following the current fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableFutureFiscalYearTwo
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Operating leases future minimum payments receivable remainder of fiscal year.

No definition available.

Name:	arii_OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear
Namespace Prefix:	arii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.