MAALP Condensed Consolidated Balance Sheets (Limited Partner [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
Limited Partner [Member]
Assets:
Land	$ 872,786,000	$ 871,316,000
Buildings and improvements	6,595,550,000	6,366,701,000
Furniture, fixtures and equipment	208,653,000	199,573,000
Development and capital improvements in progress	59,161,000	166,048,000
Real Estate Investment Property, at Cost	7,736,150,000	7,603,638,000
Less accumulated depreciation	(1,288,374,000)	(1,124,207,000)
Real Estate Investment Property, Net	6,447,776,000	6,479,431,000
Undeveloped land	58,700,000	63,850,000
Corporate properties, net	8,263,000	7,523,000
Investments in real estate joint ventures	1,802,000	5,499,000
Real estate assets, net	6,516,541,000	6,556,303,000
Cash and cash equivalents	87,766,000	89,333,000
Restricted cash	59,786,000	44,361,000
Deferred financing costs, net	17,870,000	17,424,000
Other assets	62,996,000	91,637,000
Goodwill	2,321,000	4,106,000
Assets held for sale	35,734,000	38,761,000
Total assets	6,783,014,000	6,841,925,000
Liabilities:
Secured notes payable	1,554,592,000	1,790,935,000
Unsecured notes payable	1,875,422,000	1,681,783,000
Accounts payable	10,089,000	15,067,000
Fair market value of interest rate swaps	13,132,000	20,015,000
Accrued expenses and other liabilities	238,849,000	206,268,000
Security deposits	9,970,000	9,270,000
Due to general partner	19,000	19,000
Total liabilities	3,702,073,000	3,723,357,000
Redeemable units	5,028,000	5,050,000
Capital [Abstract]
General Partners' Capital Account	2,912,499,000	2,946,598,000
Limited Partners' Capital Account	162,937,000	166,746,000
Accumulated other comprehensive income	477,000	174,000
Total Capital	3,075,913,000	3,113,518,000
Total Liabilities and Capital	$ 6,783,014,000	$ 6,841,925,000
Redeemable units, units issued and outstanding	85,164	83,139