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Fair Value Hierarchy for Financial Instruments Not Fair Valued but For Which Fair Value Is Required To Be Disclosed (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Carrying Amount    
Commercial mortgages, mezzanine loans and other loans, Carrying Amount $ 1,504,456us-gaap_LoansReceivableCommercialRealEstate $ 1,392,436us-gaap_LoansReceivableCommercialRealEstate
Carrying Amount 2,686,757us-gaap_LongTermDebt 2,615,666us-gaap_LongTermDebt
Estimated Fair Value    
Junior subordinated notes 13,183us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations 13,102us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
Estimated Fair Value    
Estimated Fair Value    
Commercial mortgages, mezzanine loans and other loans, Estimated Fair Value 1,446,466us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 1,316,796us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carrying Amount    
Carrying Amount    
Commercial mortgages, mezzanine loans and other loans, Carrying Amount 1,493,659us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,392,436us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
CMBS securitizations    
Carrying Amount    
Carrying Amount 481,546us-gaap_LongTermDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 490,863us-gaap_LongTermDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
CMBS securitizations | Estimated Fair Value    
Estimated Fair Value    
Notes payable, Estimated Fair Value 370,576us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 389,771us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
CMBS securitizations | Carrying Amount    
Carrying Amount    
Carrying Amount 369,616us-gaap_LongTermDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 389,415us-gaap_LongTermDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
7.0% convertible senior notes | Estimated Fair Value    
Estimated Fair Value    
Convertible senior notes, Estimated Fair Value 39,006us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 41,901us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
7.0% convertible senior notes | Carrying Amount    
Carrying Amount    
Carrying Amount 33,538us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 33,417us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
4.0% convertible senior notes | Estimated Fair Value    
Estimated Fair Value    
Convertible senior notes, Estimated Fair Value 121,551us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 123,677us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
4.0% convertible senior notes | Carrying Amount    
Carrying Amount    
Carrying Amount 135,085us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 134,418us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
7.625% senior notes due 2024 | Estimated Fair Value    
Estimated Fair Value    
Senior notes, Estimated Fair Value 59,160us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 56,016us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
7.625% senior notes due 2024 | Carrying Amount    
Carrying Amount    
Carrying Amount 60,000us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 60,000us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
7.125% Senior Notes due 2019 | Estimated Fair Value    
Estimated Fair Value    
Senior notes, Estimated Fair Value 67,907us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 70,064us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
7.125% Senior Notes due 2019 | Carrying Amount    
Carrying Amount    
Carrying Amount 71,905us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 71,905us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Senior Secured Notes | Estimated Fair Value    
Estimated Fair Value    
Senior notes, Estimated Fair Value 77,881us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 79,594us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Senior Secured Notes | Carrying Amount    
Carrying Amount    
Carrying Amount 67,072us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 68,314us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Junior subordinated notes, at amortized cost | Estimated Fair Value    
Estimated Fair Value    
Junior subordinated notes 14,348us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 14,471us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Junior subordinated notes, at amortized cost | Carrying Amount    
Carrying Amount    
Carrying Amount 25,100us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 25,100us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
CDO notes payable, at amortized cost | Estimated Fair Value    
Estimated Fair Value    
Notes payable, Estimated Fair Value 927,588us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 913,050us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
CDO notes payable, at amortized cost | Carrying Amount    
Carrying Amount    
Carrying Amount 1,073,122us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,073,145us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans payable on real estate | Estimated Fair Value    
Estimated Fair Value    
Loans payable on real estate, Estimated Fair Value 709,338us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 678,306us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Loans payable on real estate | Carrying Amount    
Carrying Amount    
Carrying Amount 664,761us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 643,405us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS securitizations    
Estimated Fair Value    
Notes payable, Estimated Fair Value 370,576us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 389,771us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Markets for Identical Assets (Level 1) | 7.0% convertible senior notes    
Estimated Fair Value    
Convertible senior notes, Estimated Fair Value 39,006us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember		 41,901us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointZeroZeroPercentConvertibleSeniorNotesMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | 4.0% convertible senior notes    
Estimated Fair Value    
Convertible senior notes, Estimated Fair Value 121,551us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember		 123,677us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_FourPointZeroZeroPercentConvertibleSeniorNotesMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | 7.625% senior notes due 2024    
Estimated Fair Value    
Senior notes, Estimated Fair Value 59,160us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember		 56,016us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorNotesDueTwentyTwentyFourMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | 7.125% Senior Notes due 2019    
Estimated Fair Value    
Senior notes, Estimated Fair Value 67,907us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember		 70,064us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SevenPointOneTwoFivePercentSeniorNotesMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | CDO notes payable, at amortized cost    
Estimated Fair Value    
Notes payable, Estimated Fair Value 927,588us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember		 913,050us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_CdoNotesPayableAtAmortizedCostMember
Significant Unobservable Inputs (Level 3)    
Estimated Fair Value    
Commercial mortgages, mezzanine loans and other loans, Estimated Fair Value 1,446,466us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 1,316,796us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Junior subordinated notes 13,183us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1] 13,102us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2]
Significant Unobservable Inputs (Level 3) | Senior Secured Notes    
Estimated Fair Value    
Senior notes, Estimated Fair Value 77,881us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember		 79,594us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_SeniorSecuredNotesMember
Significant Unobservable Inputs (Level 3) | Junior subordinated notes, at amortized cost    
Estimated Fair Value    
Junior subordinated notes 14,348us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember		 14,471us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_JuniorSubordinatedNotesAtAmortizedCostMember
Significant Unobservable Inputs (Level 3) | Loans payable on real estate    
Estimated Fair Value    
Loans payable on real estate, Estimated Fair Value $ 709,338us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember		 $ 678,306us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= ras_LoanPayableOnRealEstateMember
[1] During the three-month period ended March 31, 2015, there were no transfers between Level 1 and Level 2, nor were there any transfers into and out of Level 3.
[2] During the year ended December 31, 2014, there were no transfers between Level 1 and Level 2, nor were there any transfers into and out of Level 3.