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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	Aug. 31, 2018	Dec. 31, 2018 USD ($) joint_venture segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Line Items]
Investment in unconsolidated entities		$ 86,000	$ 14,240,000
Construction costs capitalization period after substantially complete		1 year
Capitalized personnel costs		$ 12,233,000	10,853,000	$ 9,347,000
Capitalized interest		14,815,000	10,655,000	11,307,000
Impairment of long-lived assets		0	0	0
Gross unrealized gain		806,000
Gross unrealized losses		$ 0
Number of operating segments \| segment		2
Income tax expense		$ 0
Rental revenues and tenant recoveries		627,400,000	643,100,000	572,000,000.0
Capitalized indirect leasing costs		7,000,000.0	8,900,000	$ 6,300,000
Future undiscounted minimum lease payments under ground leases		571,370,000
Ancillary Revenue
Accounting Policies [Line Items]
Other Revenues		23,900,000
Other Receivables		3,800,000
Parking and other
Accounting Policies [Line Items]
Other Revenues			$ 24,600,000
Other Receivables		$ 1,000,000.0
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 \| joint_venture		5
Number of joint ventures consolidated \| joint_venture		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%	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 \| joint_venture		1
VIE, ownership percentage		21.00%