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Fair value of financial instruments - Fair value, assets measure on recurring basis, unobservable inputs (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfer of real estate owned to mortgage loans $ 1,356aamc_RealEstateTransferredtoMortgageLoans $ 0aamc_RealEstateTransferredtoMortgageLoans    
Fair value, inputs, level 3 | Loans receivable | Residential mortgage        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net unrealized gain on mortgage loans held at the end of the period 51,068aamc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNetUnrealizedGainLossIncludedinEarningsforLoansHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 38,197aamc_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetNetUnrealizedGainLossIncludedinEarningsforLoansHeld
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 1,959,044us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		     1,207,163us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Investment in mortgage loans 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 612,508us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Net unrealized gain on mortgage loans 61,134aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 65,130aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Net realized gain on mortgage loans 15,382aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 9,321aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Mortgage loan dispositions and payments (65,168)aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesAndSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 (39,458)aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSalesAndSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Real estate tax advances to borrowers 7,127aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherAdditions
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 8,006aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherAdditions
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Reclassification of realized gains on real estate sold from unrealized gains 10,802aamc_ReclassificationOfRealizedGainsOnRealEstateSoldFromUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   0aamc_ReclassificationOfRealizedGainsOnRealEstateSoldFromUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		  
Transfer of real estate owned to mortgage loans 1,356aamc_RealEstateTransferredtoMortgageLoans
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 0aamc_RealEstateTransferredtoMortgageLoans
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Transfer of mortgage loans to real estate owned (136,182)aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransferToRealEstateOwned
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 (96,528)aamc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransferToRealEstateOwned
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Ending balance $ 1,853,495us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 $ 1,766,142us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 $ 1,959,044us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 $ 1,207,163us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember