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Partners' Capital of MAALP - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Capital Structure [Line Items]
Operating partnership units outstanding	118,133,172	117,943,960
General Partners' Capital Account, Units Outstanding	114,043,089	113,808,292
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	96.50%	96.50%
Limited Partners' Capital Account, Units Outstanding	4,090,083	4,135,668
Preferred Stock, Shares Outstanding	867,846		867,846
Redeemable Preferred Stock [Member]
Schedule of Capital Structure [Line Items]
Preferred Stock, Shares Outstanding	867,846
Noncontrolling Interest
Schedule of Capital Structure [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock	4,090,083	4,135,668
Limited Partners' Capital Account	$ 481.6	$ 416.3
Redeemable Capital Shares Par Or Stated Value Per Share	$ 117.76	$ 100.67

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Common Shares Issuable upon Conversion of Convertible Stock

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The number of general partner units outstanding.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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-Publisher FASB
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