XML 53 R36.htm IDEA: XBRL DOCUMENT
v3.5.0.2

MAALP Capital (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Limited Partners' Capital Account [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | $ 165,726 | $ 161,310
Net Income Allocated to Limited Partners | 9,508 | 16,078
General partner units issued in exchange for limited partner units | (780) | (236)
Adjustment for noncontrolling interest ownership in operating partnership | 13 | 58
Distributions | (10,217) | (9,671)
Ending Balance | 164,250 | 167,539
General Partners' Capital Account [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 2,993,696 | 2,890,858
Net Income Allocated to General Partners | 172,836 | 289,300
Issuance of units | (738) | 326
Units repurchased and retired | (1,811) | (957)
Units Issued During Period, Value, Unit Options Exercised |  | 420
General partner units issued in exchange for limited partner units | 780 | 236
Units issued in exchange for redeemable units | 122 |
Redeemable stock fair market value | (296) | (614)
Adjustment for noncontrolling interest ownership in operating partnership | (13) | (58)
Amortization of unearned compensation | 6,625 | 4,950
Distributions | (185,789) | (174,100)
Ending Balance | 2,985,412 | 3,010,361
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | (1,618) | (376)
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | (481) | (6,222)
Ending Balance | (2,099) | (6,598)
Total Partnership Capital [Member] |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |
Beginning Balance | 3,157,804 | 3,051,792
Net Income Available for Common Unitholders | 182,344 | 305,378
Other comprehensive (loss) income - derivatives insturments (cash flow hedges) | (481) | (6,222)
Issuance of units | (738) | 326
Units repurchased and retired | (1,811) | (957)
Units Issued During Period, Value, Unit Options Exercised |  | 420
General partner units issued in exchange for limited partner units | 0 | 0
Units issued in exchange for redeemable units | 122 |
Redeemable stock fair market value | (296) | (614)
Adjustment for noncontrolling interest ownership in operating partnership | 0 | 0
Amortization of unearned compensation | 6,625 | 4,950
Distributions | (196,006) | (183,771)
Ending Balance | $ 3,147,563 | $ 3,171,302

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 Partnership units issued in exchange for redeemable units + References No definition available. + Details
Name: | maa_Partnershipunitsissuedinexchangeforredeemableunits
Namespace Prefix: | maa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Units Issued During Period, Value, New Issues + References No definition available. + Details
Name: | maa_UnitsIssuedDuringPeriodValueNewIssues
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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=68079674&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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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_PartnersCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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