Fixed Charge Coverage Ratio.

No definition available.

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Period Type:	instant

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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Period Type:	instant

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

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- 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

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of restrictions on the entity's ability to pay dividends as required by the terms of the credit facility.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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Balance Type:	na
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- 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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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Non-Recourse Property Debt and Credit Agreement (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($) Property	Dec. 15, 2020 USD ($)	Sep. 08, 2020 Multi_family_apartment	Apr. 20, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Covenant Description	We have agreed to maintain a fixed charge coverage ratio of 1.40x, as well as other covenants customary for similar revolving credit arrangements. We expect to remain in compliance with these covenants
Number of apartment communities \| Multi_family_apartment			12
Non-recourse property debt, net	$ 3,628,236,000				$ 3,737,805,000
Outstanding borrowings under the revolving credit facility	265,600,000				275,000,000
Fixed Rate Property Debt
Debt Instrument [Line Items]
Aggregate gross book value	3,700,000,000
Non-recourse property debt, net	$ 3,631,588,000				3,740,648,000
Fixed Rate Property Debt \| Maximum [Member]
Debt Instrument [Line Items]
Note maturity date	Jan. 01, 2055
Fixed Rate Property Debt \| Pledged as Collateral
Debt Instrument [Line Items]
Number of apartment communities \| Property	57
Variable Rate Property Debt
Debt Instrument [Line Items]
Aggregate gross book value	$ 14,500,000
Non-recourse property debt, net	$ 14,505,000				14,505,000
Variable Rate Property Debt \| Maximum [Member]
Debt Instrument [Line Items]
Note maturity date	Jul. 13, 2033
Variable Rate Property Debt \| Pledged as Collateral
Debt Instrument [Line Items]
Number of apartment communities \| Property	3
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, dividend restrictions	aggregate amount that does not exceed the greater of 95% of our funds from operations, as defined by NAREIT, for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain AIR’s REIT status.
Fixed charge coverage ratio	1.40
Initial interest rate for credit facility	LIBOR plus 1.00%, or, at our option, a base rate plus 0.0%
Outstanding borrowings under the revolving credit facility	$ 265,600,000				$ 275,000,000.0
Credit facility maturity date	Jan. 22, 2022
Credit facility interest rate at period end	1.46%				3.00%
Amount outstanding for undrawn letters of credit issued under revolving credit facility	$ 23,700,000
Remaining borrowing capacity under credit facility	$ 310,700,000
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread on variable interest rate	1.00%
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Spread on variable interest rate	0.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity of revolving credit facility		$ 800,000,000.0
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity of revolving credit facility		$ 600,000.0
Term Loan [Member]
Debt Instrument [Line Items]
Non-recourse property debt, net				$ 350,000,000.0
Note maturity date	Apr. 20, 2021
Initial interest rate for credit facility	30-day LIBOR plus 1.60%, with a 50 basis point LIBOR floor
Term Loan [Member] \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread on variable interest rate	1.60%
Floor interest rate	0.50%