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Area of a real estate property.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
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-URI http://asc.fasb.org/extlink&oid=108788376&loc=SL6759159-111685

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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Oct. 09, 2018	Mar. 01, 2018 ft²	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) joint_venture	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Investment in unconsolidated entities			$ 92		$ 92		$ 14,240
Rental revenue and tenant recoveries			166,600	$ 175,300	491,200	$ 501,400
Indirect leasing costs capitalized during period			1,700	$ 1,800	5,500	$ 5,000
Future undiscounted minimum lease payments on ground leases			$ 505,077		$ 505,077
Ferry Building Property \| Subsequent Event
Variable Interest Entity [Line Items]
Ownership Interest	55.00%
VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of joint ventures meeting VIE definition \| joint_venture					4
Number of joint ventures consolidated \| joint_venture					3
VIE, Primary Beneficiary \| HPP-MAC WSP, LLC
Variable Interest Entity [Line Items]
Ownership Interest		75.00%			75.00%
VIE, Primary Beneficiary \| HPP-MAC WSP, LLC \| Macerich, WSP, LLC
Variable Interest Entity [Line Items]
Ownership Interest		25.00%
VIE, Primary Beneficiary \| One Westside
Variable Interest Entity [Line Items]
Area of real estate property, retail and entertainment space (in square feet) \| ft²		500,000
VIE, Primary Beneficiary \| 10850 Pico
Variable Interest Entity [Line Items]
Area of real estate property, retail and entertainment space (in square feet) \| ft²		95,987
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of joint ventures not consolidated \| joint_venture					1
Ownership Interest					21.00%