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MAALP Capital - Summary of Changes in Total Capital and its Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	$ 6,325,280	$ 6,520,344	$ 6,372,170	$ 6,573,875
Net Income Available for Common Unitholders	64,141	61,981	130,099	112,801
Other comprehensive (loss) income - derivatives instruments (cash flow hedges)	(6,004)	5,165	(9,205)	5,804
Issuance of units	(519)	(341)	610	(236)
Units repurchased and retired	(701)		(3,724)	(2,912)
Units Issued During Period, Value, Unit Options Exercised	1,032		1,240	625
Units issued in exchange for redeemable units	575		575	1,915
Redeemable stock fair market value	(835)	(892)	(2,186)	73
Amortization of unearned compensation	3,452	2,963	8,237	6,987
Dividends, Preferred Stock, Cash	(922)	(922)	(1,844)	(1,844)
Distributions	(113,482)	(108,837)	(226,815)	(217,627)
Contribution from noncontrolling interest	490		3,350
Ending Balance	6,272,507	6,479,461	6,272,507	6,479,461
Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	218,011	226,815	220,043	231,676
Net income	2,224	2,174	4,522	3,975
General partnership units issued in exchange for limited partnership units	(821)	(338)	(1,157)	(3,118)
Adjustment for limited partners' capital at redemption value	(85)	(24)	(138)	(87)
Distributions	(3,925)	(3,814)	(7,866)	(7,633)
Ending Balance	215,404	224,813	215,404	224,813
General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	6,038,625	6,221,216	6,083,142	6,270,758
Net Income Allocated to General Partners	60,995	58,885	123,733	106,982
Issuance of units	(519)	(341)	610	(236)
Units repurchased and retired	(701)		(3,724)	(2,912)
Units Issued During Period, Value, Unit Options Exercised	1,032		1,240	625
General partnership units issued in exchange for limited partnership units	821	338	1,157	3,118
Units issued in exchange for redeemable units	575		575	1,915
Redeemable stock fair market value	(835)	(892)	(2,186)	73
Adjustment for limited partners' capital at redemption value	85	24	138	87
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(233)
Amortization of unearned compensation	3,452	2,963	8,237	6,987
Distributions	(109,557)	(105,023)	(218,949)	(209,994)
Ending Balance	5,993,973	6,177,170	5,993,973	6,177,170
Accumulated Distributions in Excess of Net Income [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	66,840	66,840	66,840	66,840
Net income	922	922	1,844	1,844
Redeemable stock fair market value	(835)	(892)	(2,186)	73
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(233)
Dividends, Preferred Stock, Cash	(922)	(922)	(1,844)	(1,844)
Ending Balance	66,840	66,840	66,840	66,840
AOCI Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	(3,362)	3,167	(161)	2,295
Other comprehensive (loss) income - derivatives instruments (cash flow hedges)	(6,004)	5,165	(9,205)	5,804
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				233
Ending Balance	(9,366)	8,332	(9,366)	8,332
Noncontrolling Interest
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	5,166	2,306	2,306	2,306
Contribution from noncontrolling interest	490		3,350
Ending Balance	$ 5,656	$ 2,306	$ 5,656	$ 2,306

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