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Investments in Loans (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Loan
Dec. 31, 2014
Loan
Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance $ 1,518,969us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 1,409,254us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Conduit Loans    
Mortgage Loans on Real Estate [Line Items]    
Number of Loans 5us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember		 11us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember
Unpaid Principal Balance $ 129,550us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember		 $ 93,925us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember
Weighted-Average Coupon 4.30%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember		 4.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= ras_ConduitLoansMember