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Loans on Watchlist or Considered to be Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]        
Impaired loans $ 1,518,969us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 1,409,254us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial    
Allowance for losses 10,797us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 9,218us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 14,279us-gaap_AllowanceForLoanAndLeaseLossesRealEstate 22,955us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Watchlist        
Financing Receivable, Impaired [Line Items]        
Impaired loans expecting full recovery 55,839us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 67,839us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		    
Impaired loans with reserves 24,851us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 13,281us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		    
Impaired loans 80,690us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 [1] 81,120us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 [2]    
Commercial mortgages        
Financing Receivable, Impaired [Line Items]        
Impaired loans 1,257,942us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 [3] 1,148,290us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 [4]    
Commercial mortgages | Watchlist        
Financing Receivable, Impaired [Line Items]        
Impaired loans expecting full recovery 22,920us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 22,920us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		    
Impaired loans 22,920us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 [1] 22,920us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		 [2]    
Mezzanine Loans        
Financing Receivable, Impaired [Line Items]        
Impaired loans 226,174us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 226,105us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		    
Allowance for losses 9,471us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 7,892us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 12,960us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 21,636us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember
Mezzanine Loans | Watchlist        
Financing Receivable, Impaired [Line Items]        
Impaired loans expecting full recovery 28,559us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 40,559us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		    
Impaired loans with reserves 21,201us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 9,631us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		    
Impaired loans 49,760us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 [1] 50,190us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_MezzanineLoansMember		 [2]    
Preferred Equity Interests        
Financing Receivable, Impaired [Line Items]        
Impaired loans 34,853us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 34,859us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		    
Allowance for losses 1,326us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 1,326us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 1,319us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 1,319us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember
Preferred Equity Interests | Watchlist        
Financing Receivable, Impaired [Line Items]        
Impaired loans expecting full recovery 4,360us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 4,360us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		    
Impaired loans with reserves 3,650us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 3,650us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		    
Impaired loans $ 8,010us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 [1] $ 8,010us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ us-gaap_LongtermDebtTypeAxis
= ras_PreferredEquityInterestsMember		 [2]    
[1] As of March 31, 2015, this includes $5,500 of unpaid principal relating to previously identified troubled debt restructurings (TDRs) that are on accrual status.
[2] As of December 31, 2014, there were no previously identified TDRs that were on accrual status included in impaired loans.
[3] Commercial mortgages includes five conduit loans with an unpaid principal balance and carrying amount of $129,550, a weighted-average coupon of 4.3% and maturity dates ranging from November 2022 through May 2025. These commercial mortgages are accounted for as loans held for sale.
[4] Commercial mortgages includes 11 conduit loans with an unpaid principal balance and carrying amount of $93,925, a weighted-average coupon of 4.6% and maturity dates ranging from November 2019 through January 2025. These commercial mortgages are accounted for as loans held for sale.