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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% |  |

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