MAALP Capital (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Increase (Decrease) in Partners' Capital [Roll Forward]
Dividends, Preferred Stock, Cash		$ 0
Limited Partner [Member]
Capital Disclosure [Line Items]
Noncontrolling Interest in Joint Ventures	$ 2,306,000		$ 2,306,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Dividends, Preferred Stock, Cash	922,000	0
Limited Partner [Member] | General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	6,337,721,000	2,993,696,000	2,993,696,000
Net Income Allocated to General Partners	40,983,000	43,413,000
Issuance of units	68,000	90,000
Units repurchased and retired	(4,734,000)	(1,730,000)
General partner units issued in exchange for limited partner units	167,000	33,000
Units issued in exchange for redeemable units	1,482,000	123,000
Redeemable stock fair market value	(298,000)	(1,100,000)
Adjustment for noncontrolling interest ownership in operating partnership	192,000	172,000
Amortization of unearned compensation	3,025,000	2,078,000
Distributions	(98,841,000)	(61,928,000)
Ending Balance	6,279,765,000	2,974,847,000	6,337,721,000
Limited Partner [Member] | Total Partnership Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	6,642,082,000	3,157,804,000	3,157,804,000
Net Income Available for Common Unitholders	43,416,000	45,808,000
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)	3,192,000	(2,519,000)
Issuance of units	2,075,000	90,000
Units repurchased and retired	(4,734,000)	(1,730,000)
General partner units issued in exchange for limited partner units	0	0
Units issued in exchange for redeemable units	1,482,000	123,000
Redeemable stock fair market value	(298,000)	(1,100,000)
Adjustment for noncontrolling interest ownership in operating partnership	0	0
Amortization of unearned compensation	3,025,000	2,078,000
Distributions	(102,505,000)	(65,340,000)
Dividends, Preferred Stock, Cash	922,000
Ending Balance	6,586,813,000	3,135,214,000	6,642,082,000
Limited Partner [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	235,976,000	165,726,000	165,726,000
Net Income Allocated to Limited Partners	1,511,000	2,395,000
General partner units issued in exchange for limited partner units	(167,000)	(33,000)
Adjustment for noncontrolling interest ownership in operating partnership	(192,000)	(172,000)
Distributions	(3,664,000)	(3,412,000)
Ending Balance	233,464,000	164,504,000	235,976,000
Limited Partner [Member] | AOCI Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	1,246,000	(1,618,000)	(1,618,000)
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)	3,192,000	(2,519,000)
Ending Balance	4,438,000	(4,137,000)	1,246,000
Accumulated Distributions in Excess of Net Income [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive (loss) income - derivatives insturments (cash flow hedges)	0
Redeemable stock fair market value	(298,000)	$ (1,100,000)
Adjustment for noncontrolling interest ownership in operating partnership	0
Amortization of unearned compensation	(114,000)
Accumulated Distributions in Excess of Net Income [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of units	2,007,000		$ 64,833,000
Dividends, Preferred Stock, Cash	922,000
Preferred Stock Including Additional Paid in Capital [Member] | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Ending Balance	$ 66,840,000