XML 47 R35.htm IDEA: XBRL DOCUMENT
v3.20.1

MAALP Capital - Summary of Changes in Total Capital and its Components (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Dividends, Preferred Stock, Cash | $ (922) | $ (922)
M A A L P |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 6,289,440 | 6,372,170
Net Income Available for Common Unitholders | 37,952 | 65,958
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 253 | (3,201)
Issuance of units | 39 | 1,129
Units repurchased and retired | (1,727) | (3,023)
Exercise of unit options | 71 | 208
Redeemable stock fair market value adjustment | 3,111 | (1,351)
Amortization of unearned compensation | 5,289 | 4,785
Dividends, Preferred Stock, Cash | (922) | (922)
Distributions | (118,361) | (113,333)
Contribution from noncontrolling interest | 401 | 2,860
Ending Balance | 6,215,546 | 6,325,280
M A A L P | Limited Partner [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 214,647 | 220,043
Net income | 1,304 | 2,298
General partnership units issued in exchange for limited partnership units | (450) | (336)
Adjustment for limited partners’ capital at redemption value | 56 | (53)
Distributions | (4,059) | (3,941)
Ending Balance | 211,498 | 218,011
M A A L P | General Partners' Capital Account [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 6,015,290 | 6,083,142
Net Income Allocated to General Partners | 35,726 | 62,738
Issuance of units | 39 | 1,129
Units repurchased and retired | (1,727) | (3,023)
Exercise of unit options | 71 | 208
General partnership units issued in exchange for limited partnership units | 450 | 336
Redeemable stock fair market value adjustment | 3,111 | (1,351)
Adjustment for limited partners’ capital at redemption value | (56) | 53
Amortization of unearned compensation | 5,289 | 4,785
Distributions | (114,302) | (109,392)
Ending Balance | 5,943,891 | 6,038,625
M A A L P | Accumulated Distributions in Excess of Net Income [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 66,840 | 66,840
Net income | 922 | 922
Dividends, Preferred Stock, Cash | (922) | (922)
Ending Balance | 66,840 | 66,840
M A A L P | AOCI Attributable to Noncontrolling Interest [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | (13,584) | (161)
Other comprehensive income (loss) - derivatives instruments (cash flow hedges) | 253 | (3,201)
Ending Balance | (13,331) | (3,362)
M A A L P | Noncontrolling Interests-Consolidated Real Estate Entities [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 6,247 | 2,306
Contribution from noncontrolling interest | 401 | 2,860
Ending Balance | $ 6,648 | $ 5,166

X
- Definition Adjustment for limited partners' capital at redemption value. + References No definition available. + Details
Name: | maa_AdjustmentForLimitedPartnersCapitalAtRedemptionValue
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amortization of unearned compensation + References No definition available. + Details
Name: | maa_AmortizationUnearnedCompensation
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Distributions + References No definition available. + Details
Name: | maa_Distributions
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value option and measurement. + References No definition available. + Details
Name: | maa_EffectOnRetainedEarningsAccumulatedDeficitDueToFairValueOptionAndMeasurement
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition General Partnership Units Issued in Exchange for Limited Partnership Units + References No definition available. + Details
Name: | maa_GeneralPartnershipUnitsIssuedInExchangeForLimitedPartnershipUnits
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Income Available for Common Unitholders + References No definition available. + Details
Name: | maa_NetIncomeAvailableForCommonUnitholders
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Units Issued during period value new issues net. + References No definition available. + Details
Name: | maa_UnitsIssuedDuringPeriodValueNewIssuesNet
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Units Issued During Period, Value, Unit Options Exercised + References No definition available. + Details
Name: | maa_UnitsIssuedDuringPeriodValueUnitOptionsExercised
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Units Repurchased and Retired During Period, Value. + References No definition available. + Details
Name: | maa_UnitsRepurchasedAndRetiredDuringPeriodValue
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_DividendsPreferredStockCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInPartnersCapitalRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 + Details
Name: | us-gaap_MinorityInterestPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate amount of net income allocated to general partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
Name: | us-gaap_NetIncomeLossAllocatedToGeneralPartners
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate amount of net income allocated to limited partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
Name: | us-gaap_NetIncomeLossAllocatedToLimitedPartners
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of ownership interest of different classes of partners in limited partnership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
Name: | us-gaap_PartnersCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=maa_MAALPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerCapitalComponentsAxis=us-gaap_LimitedPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerCapitalComponentsAxis=maa_GeneralPartnersCapitalAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AociAttributableToNoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |