Debt Instrument, Term, Extension Option

No definition available.

Name:	aamc_DebtInstrumentTermExtensionOption
Namespace Prefix:	aamc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Maximum Borrowing Capacity, Uncommitted

+ References

No definition available.

+ Details

Name:	aamc_LineofCreditFacilityMaximumBorrowingCapacityUncommitted
Namespace Prefix:	aamc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number Of Rental Properties

+ References

No definition available.

+ Details

Name:	aamc_NumberOfRentalProperties
Namespace Prefix:	aamc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Terms For Loan Agreement

+ References

No definition available.

+ Details

Name:	aamc_NumberOfTermsForLoanAgreement
Namespace Prefix:	aamc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_EscrowDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=aamc_FYRSFRLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aamc_MSLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aamc_CSrepurchaseagreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aamc_NomuraloanandsecurityagreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=aamc_LoanandSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aamc_HOMEIILoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=aamc_HOMESFRBorrowerIILLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aamc_RentalHomeAssociatesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings - Narrative (Details)	3 Months Ended	12 Months Ended
Borrowings - Narrative (Details)	Mar. 31, 2019 USD ($) loan_term property	Dec. 31, 2018 USD ($) loan_term property	Apr. 26, 2019	Apr. 05, 2019	Dec. 07, 2018 property	Aug. 08, 2018 property
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 2,014,679,000	$ 2,014,897,000
Number of rental properties \| property	14,885	15,445				2,015
FYR SFR Loan Agreement
Debt Instrument [Line Items]
Escrow deposit	$ 5,100,000	$ 2,900,000
MS Loan Agreement
Debt Instrument [Line Items]
Number of rental properties \| property					4,262
Escrow deposit	7,800,000	8,200,000
Repurchase agreements \| CS Repurchase Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 250,000,000	$ 250,000,000
Repurchase agreements \| CS Repurchase Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate	3.00%	3.00%
Secured debt \| Nomura Loan Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 250,000,000.0
Uncommitted maximum borrowing amount	150,000,000.0
Loan agreement \| Nomura Loan Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 250,000,000	$ 250,000,000
Loan agreement \| Nomura Loan Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate	3.00%	3.00%
Loan agreement \| HOME II Loan Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 83,270,000	$ 83,270,000
Loan agreement \| HOME II Loan Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate	2.10%	2.10%
Loan agreement \| FYR SFR Loan Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 508,700,000	$ 508,700,000
Loan agreement \| MS Loan Agreement
Debt Instrument [Line Items]
Amount borrowed pursuant to loan agreement	$ 504,986,000	$ 504,986,000
Loan agreement \| MS Loan Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate	1.80%	1.80%
Subsequent Event \| Repurchase agreements \| CS Repurchase Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate			2.30%
Subsequent Event \| Loan agreement \| Nomura Loan Agreement \| LIBOR
Debt Instrument [Line Items]
Interest Rate				2.30%
HOME SFR Borrower II, LLC \| Secured debt \| HOME II Loan Agreement
Debt Instrument [Line Items]
Number of terms for loan agreement \| loan_term	3	3
Length of loan term extension option, years	1 year	1 year
Rental Home Associates LLC
Debt Instrument [Line Items]
Number of rental properties \| property						2,798