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Fair value of financial instruments - Fair value, assets and liabilities measured on recurring and nonrecurring basis (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Real estate assets held for sale $ 168,942aamc_RealEstateAssetsHeldForSaleFairValueDisclosures $ 96,041aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
Fair value, inputs, level 1 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Transfer of mortgage loans to real estate owned 0aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Mortgage loans held for sale 0aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Repurchase agreements at fair value 0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Other secured borrowings 0aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair value, inputs, level 2 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Mortgage loans held for sale 0aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Repurchase agreements at fair value 929,287us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,015,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Other secured borrowings 377,420aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 336,409aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair value, inputs, level 3    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Mortgage loans held for sale 12,485aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 12,535aamc_MortgageLoansHeldforInvestmentFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Repurchase agreements at fair value 0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Other secured borrowings 0aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0aamc_SecuredDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair value measurements, recurring [Member] | Fair value, inputs, level 1 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Mortgage loans 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements, recurring [Member] | Fair value, inputs, level 2 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Mortgage loans 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements, recurring [Member] | Fair value, inputs, level 3    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Mortgage loans 1,853,495us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 1,959,044us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair value measurements, nonrecurring [Member] | Fair value, inputs, level 1 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Real estate assets held for sale 0aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 0aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Transfer of real estate owned to mortgage loans 0aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 0aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Transfer of mortgage loans to real estate owned   0aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair value measurements, nonrecurring [Member] | Fair value, inputs, level 2 [Member]    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Real estate assets held for sale 0aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 0aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
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= us-gaap_FairValueInputsLevel2Member
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= us-gaap_FairValueMeasurementsNonrecurringMember
Transfer of real estate owned to mortgage loans 0aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 0aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Transfer of mortgage loans to real estate owned 0aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 0aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair value measurements, nonrecurring [Member] | Fair value, inputs, level 3    
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]    
Real estate assets held for sale 168,942aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 96,041aamc_RealEstateAssetsHeldForSaleFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
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Transfer of real estate owned to mortgage loans 1,356aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 8,400aamc_RealEstateTransferredtoMortgageLoansFairValueDisclosures
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Transfer of mortgage loans to real estate owned $ 136,182aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 $ 595,668aamc_RealEstateAcquisitionsThroughForeclosuresFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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