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INVESTMENTS IN REAL ESTATE (Investments in Real Estate) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Properties owned, net of accumulated depreciation [Line Items]      
Real Estate Investment Property, Net $ 16,833us-gaap_RealEstateInvestmentPropertyNet   $ 17,097us-gaap_RealEstateInvestmentPropertyNet
Rental income 1,200us-gaap_RentalIncomeNonoperating 939us-gaap_RentalIncomeNonoperating  
Hotel property (Savannah, Georgia) [Member]      
Properties owned, net of accumulated depreciation [Line Items]      
Real Estate Investment Property, Net 9,851us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
  10,110us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
Office building (Philadelphia, Pennsylvania) [Member]      
Properties owned, net of accumulated depreciation [Line Items]      
Real Estate Investment Property, Net 870us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
  888us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Total Properties Owned [Member]      
Properties owned, net of accumulated depreciation [Line Items]      
Real Estate Investment Property, Net 10,721us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_TotalPropertiesOwnedMember
  10,998us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_TotalPropertiesOwnedMember
Accumulated depreciation 9,335us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_TotalPropertiesOwnedMember
  9,198us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_TotalPropertiesOwnedMember
Partnerships and other investments [Member]      
Properties owned, net of accumulated depreciation [Line Items]      
Real Estate Investment Property, Net $ 6,112us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_OtherRealEstateHoldingsMember
  $ 6,099us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= rexi_OtherRealEstateHoldingsMember