[Line Items] for Accounting Policies [Table]

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Capitalized Costs, Personnel

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Construction Costs Capitalization Period After Substantially Complete

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Long-Term Purchase Commitment, Remaining Contribution Amount

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Payments To Acquire Investments, To Date

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Unrealized Gain (Loss) On Unconsolidated Non-Real Estate Investments

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Variable Interest Entity, Number Of Joint Ventures Consolidated

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Variable Interest Entity, Number Of Joint Ventures Not Consolidated

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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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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Summary of Significant Accounting Policies - Narrative and Additional Information (Details)		12 Months Ended
	Oct. 05, 2018 USD ($)	Dec. 31, 2019 USD ($) jointVenture	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jun. 16, 2016
Accounting Policies [Line Items]
Investment in unconsolidated real estate entity		$ 64,926,000	$ 0
Construction costs capitalization period after substantially complete		1 year
Capitalized personnel costs		$ 9,218,000	12,233,000	$ 10,853,000
Capitalized interest		16,258,000	14,815,000	10,655,000
Impairment charges		52,201,000	0	0
Impairment of goodwill		0	0	$ 0
Gross unrealized gains		3,800,000
Gross unrealized losses		$ 0
Weighted average incremental borrowing rate		5.70%
Weighted average remaining lease term		32 years
Income tax expense		$ 0
ASU 2016-02 (ASC 842)
Accounting Policies [Line Items]
Cumulative adjustment related to adoption of new accounting pronouncement			2,105,000		$ 1,800,000
Accumulated deficit					$ 300,000
Joint Venture, Blackstone Property Partners
Accounting Policies [Line Items]
Joint venture, ownership percentage		20.00%
Joint Venture Secured By Land In Santa Clara, California
Accounting Policies [Line Items]
Joint venture, ownership percentage						21.00%
Investment in unconsolidated real estate entity		$ 0	$ 86,000
Real Estate Technology Venture Capital Fund
Accounting Policies [Line Items]
Commitment to fund amount	$ 20,000,000.0
Contributions to date		2,800,000
Amount remaining to be contributed		17,200,000
Unrealized gain		$ 928,000
Building and improvements
Accounting Policies [Line Items]
Estimated useful life		39 years
Land improvements
Accounting Policies [Line Items]
Estimated useful life		15 years
Furniture and fixtures \| Minimum
Accounting Policies [Line Items]
Estimated useful life		5 years
Furniture and fixtures \| Maximum
Accounting Policies [Line Items]
Estimated useful life		7 years
VIE, primary beneficiary
Accounting Policies [Line Items]
Number of joint ventures meeting the VIE definition \| jointVenture		5
Number of joint ventures consolidated \| jointVenture		4
VIE, primary beneficiary \| 1455 Market
Accounting Policies [Line Items]
VIE, ownership percentage		55.00%
VIE, primary beneficiary \| Hill7
Accounting Policies [Line Items]
VIE, ownership percentage		55.00%
VIE, primary beneficiary \| One Westside and 10850 Pico
Accounting Policies [Line Items]
VIE, ownership percentage		75.00%
VIE, primary beneficiary \| One Westside and 10850 Pico \| Macerich
Accounting Policies [Line Items]
VIE, ownership percentage		25.00%
VIE, primary beneficiary \| Ferry Building
Accounting Policies [Line Items]
VIE, ownership percentage		55.00%
VIE, not primary beneficiary
Accounting Policies [Line Items]
Number of joint ventures not consolidated \| jointVenture		1