MAALP Consolidated Balance Sheets - Limited Partner [Member] - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets:
Land	$ 926,532,000	$ 913,408,000
Buildings and improvements	6,939,288,000	6,781,210,000
Furniture, fixtures and equipment	228,157,000	214,742,000
Development and capital improvements in progress	44,355,000	80,772,000
Real estate investment property, at cost	8,138,332,000	7,990,132,000
Less accumulated depreciation	(1,482,368,000)	(1,358,400,000)
Real Estate Investment Property, Net	6,655,964,000	6,631,732,000
Undeveloped land	51,779,000	55,997,000
Corporate properties, net	8,812,000	7,988,000
Investments in real estate joint ventures	1,811,000	1,791,000
Real estate assets, net	6,718,366,000	6,697,508,000
Cash and cash equivalents	37,559,000	26,653,000
Restricted cash	26,082,000	28,181,000
Deferred financing costs, net	5,232,000	5,996,000
Other assets	58,935,000	61,119,000
Goodwill	1,607,000	2,321,000
Total assets	6,847,781,000	6,821,778,000
Liabilities:
Secured notes payable	1,286,236,000	1,589,641,000
Unsecured notes payable	2,141,332,000	1,923,058,000
Accounts payable	5,922,000	8,395,000
Fair market value of interest rate swaps	10,358,000	13,392,000
Accrued expenses and other liabilities	226,237,000	219,044,000
Security deposits	11,623,000	10,526,000
Due to general partner	19,000	19,000
Total liabilities	3,681,727,000	3,764,075,000
Redeemable units	8,250,000	5,911,000
Capital [Abstract]
General Partner: 75,267,675 OP Units outstanding at December 31, 2014 and 74,830,726 OP Units outstanding at December 31, 2013	2,993,696,000	2,890,858,000
Limited Partners: 4,191,152 OP Units outstanding at December 31, 2014 and 4,227,384 OP Units outstanding at December 31, 2013	165,726,000	161,310,000
Accumulated other comprehensive (loss) income	(1,618,000)	(376,000)
Total capital	3,157,804,000	3,051,792,000
Liabilities and capital	$ 6,847,781,000	$ 6,821,778,000
Redeemable stock, shares/units issued and outstanding	90,844	87,818