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Earnings per OP Unit of MAALP Parenthetical (Details) (Restricted Stock [Member], Limited Partner [Member])
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restricted Stock [Member] | Limited Partner [Member]
   
Earnings Per Share Disclosure [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_LimitedPartnerMember
0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_LimitedPartnerMember