CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Fees From Unconsolidated Investment Entities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Commercial Finance, Four Investment Entities [Member]
Related Party Transaction [Line Items]
Amount waived of the fund management fees from commercial finance investment entities	$ 49	$ 224
Real estate [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities	9,434	8,925
Discounts recorded	207	33
Financial fund management [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities	782	802
CVC Credit Partners, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	229	181
RRE Opportunity REIT I [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	888	351
Dividends paid	15	29
RRE Opportunity REIT II [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	737	502
Dividends paid	7	0
LEAF [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	36	36
Payment for sub-servicing the commercial finance investment partnerships	(23)	(127)
1845 Walnut Associates Ltd. [Member]
Related Party Transaction [Line Items]
Payment for rent and operating expenses	(207)	(204)
Property management fees	38	16
Brandywine Construction & Management, Inc. [Member]
Related Party Transaction [Line Items]
Payment for property management of hotel property	(52)	(40)
Atlas Energy, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	13	30
Ledgewood P.C. [Member]
Related Party Transaction [Line Items]
Payment for legal services	(34)	(24)
Graphic Images, LLC [Member]
Related Party Transaction [Line Items]
Payment for printing services	(48)	(60)
The Bancorp, Inc. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	0	27
9 Henmar LLC [Member]
Related Party Transaction [Line Items]
Payment of broker/consulting fees	$ (3)	$ (3)

Represents the amount waived of the fund management fees from commercial finance investment entities.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Payment to related party for services provided.

+ References

No definition available.

+ Details

Name:	rexi_BrokerConsultingFeesPaid
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Disclosure of the amount of the discount on the receivable which is deducted from the face amount of the receivable and revenue for the period. The discount is the difference between the present value and the face amount.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the amount of fees from unconsolidated investment entities.

+ References

No definition available.

+ Details

Name:	rexi_FeesFromUnconsolidatedInvestmentEntities
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
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- Definition

Represent the amount paid for rent and operating expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount paid to LEAF for sub-servicing agreement to provide management services for the commercial finance funds.

+ References

No definition available.

+ Details

Name:	rexi_PaymentForSubServicingCommercialFinanceInvestmentPartnerships
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Repayment received or receivable for expenses incurred on behalf of a related party.

+ References

No definition available.

+ Details

Name:	rexi_ReimbursementOfRelatedPartyCosts
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Payment to related party for services provided.

+ References

No definition available.

+ Details

Name:	rexi_RelatedPartyFeesPaid
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payment to related party for payment of legal services provided.

+ References

No definition available.

+ Details

Name:	rexi_RelatedPartyLegalFeesPaid
Namespace Prefix:	rexi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of dividend income on nonoperating securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_InvestmentIncomeDividend
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate costs related to management of owned properties during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_OwnedPropertyManagementCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of revenue derived from managing real estate properties.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyManagementFeeRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_CvcCreditPartnersLPMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_EighteenFortyFiveWalnutAssociatesLtdMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_FinancialFundManagementInvestmentMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_GraphicImagesLlcMember
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_LeafCommercialCapitalIncMember
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_LedgewoodPcMember
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_NineHenmarLlcMember
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_RealEstateInvestmentEntitiesSegmentMember
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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rexi_ResourceRealEstateOpportunityREITIIInc.Member
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- Details

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