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Summary of Investments in Real Estate (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]    
Investments in real estate, Book Value $ 1,833,978us-gaap_RealEstateInvestmentPropertyAtCost $ 1,840,451us-gaap_RealEstateInvestmentPropertyAtCost
Accumulated depreciation and amortization 175,319us-gaap_RealEstateAccumulatedDepreciation [1] 168,480us-gaap_RealEstateAccumulatedDepreciation [1]
IRT    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 689,867us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_RelatedPartyTransactionAxis
= ras_IndependenceRealtyTrustIncMember		 689,112us-gaap_RealEstateInvestmentPropertyAtCost
/ us-gaap_RelatedPartyTransactionAxis
= ras_IndependenceRealtyTrustIncMember
Accumulated depreciation and amortization $ 27,261us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RelatedPartyTransactionAxis
= ras_IndependenceRealtyTrustIncMember		 $ 23,376us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RelatedPartyTransactionAxis
= ras_IndependenceRealtyTrustIncMember
[1] As of March 31, 2015, includes properties owned by Independence Realty Trust, Inc., or IRT, with a book value of $689,867 and accumulated depreciation of $27,261. As of December 31, 2014, includes properties owned by IRT, with a book value of $689,112 and accumulated depreciation of $23,376.