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Investments in Securities and Security-Related Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Investment Securities [Line Items]  
Total investments in securities, Amortized Cost $ 225,600ras_AmortizedCost
Total investments in securities, Gains 3,048ras_MarketableSecuritiesUnrealizedGains
Total investments in securities, Losses (197,236)ras_MarketableSecuritiesUnrealizedLosses
Investments in securities and security-related receivables, at fair value 31,412us-gaap_MarketableSecurities
Total investments in securities, Weighted Average Coupon 3.60%ras_WeightedAverageCoupon [1]
Total investments in securities, Weighted Average Years to Maturity 22 years 8 months 12 days
Security-related receivables  
Investment Securities [Line Items]  
Total investments in securities, Amortized Cost 15,000ras_AmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Total investments in securities, Gains 995ras_MarketableSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Total investments in securities, Losses (3,750)ras_MarketableSecuritiesUnrealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Investments in securities and security-related receivables, at fair value 12,245us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Total investments in securities, Weighted Average Coupon 6.30%ras_WeightedAverageCoupon
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [1]
Total investments in securities, Weighted Average Years to Maturity 13 years 6 months
Security-related receivables | Unsecured REIT note receivables  
Investment Securities [Line Items]  
Total investments in securities, Amortized Cost 10,000ras_AmortizedCost
/ invest_InvestmentAxis
= ras_UnsecuredReitNoteReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Total investments in securities, Gains 995ras_MarketableSecuritiesUnrealizedGains
/ invest_InvestmentAxis
= ras_UnsecuredReitNoteReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Investments in securities and security-related receivables, at fair value 10,995us-gaap_MarketableSecurities
/ invest_InvestmentAxis
= ras_UnsecuredReitNoteReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember
Total investments in securities, Weighted Average Coupon 6.70%ras_WeightedAverageCoupon
/ invest_InvestmentAxis
= ras_UnsecuredReitNoteReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [1]
Total investments in securities, Weighted Average Years to Maturity 3 years
Security-related receivables | CMBS receivables  
Investment Securities [Line Items]  
Total investments in securities, Amortized Cost 5,000ras_AmortizedCost
/ invest_InvestmentAxis
= ras_CmbsReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [2]
Total investments in securities, Losses (3,750)ras_MarketableSecuritiesUnrealizedLosses
/ invest_InvestmentAxis
= ras_CmbsReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [2]
Investments in securities and security-related receivables, at fair value 1,250us-gaap_MarketableSecurities
/ invest_InvestmentAxis
= ras_CmbsReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [2]
Total investments in securities, Weighted Average Coupon 5.70%ras_WeightedAverageCoupon
/ invest_InvestmentAxis
= ras_CmbsReceivablesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ras_SecurityRelatedReceivablesMember		 [1],[2]
Total investments in securities, Weighted Average Years to Maturity 34 years 6 months [2]
Available-for-sale Securities  
Investment Securities [Line Items]  
Total investments in securities, Amortized Cost 210,600ras_AmortizedCost
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [3]
Total investments in securities, Gains 2,053ras_MarketableSecuritiesUnrealizedGains
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [3]
Total investments in securities, Losses (193,486)ras_MarketableSecuritiesUnrealizedLosses
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [3]
Investments in securities and security-related receivables, at fair value $ 19,167us-gaap_MarketableSecurities
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [3]
Total investments in securities, Weighted Average Coupon 3.50%ras_WeightedAverageCoupon
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember		 [1],[3]
Total investments in securities, Weighted Average Years to Maturity 23 years 1 month 6 days [3]
[1] Weighted-average coupon is calculated on the unpaid principal amount of the underlying instruments, which does not necessarily correspond to the carrying amount.
[2] CMBS receivables include securities with a fair value totaling $1,250 that are rated "D" by Standard & Poor's
[3] As of December 31, 2014, this includes available-for-sale securities that are accounted for under the fair value option other than an available-for-sale security that has an amortized cost of $3,600 and a carrying value of $3,606.