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Summary of Significant Accounting Policies - Narrative (Details) ft² in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 01, 2018 ft² | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) joint_venture | Jun. 30, 2017 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Rental revenue and tenant recoveries |  | $ 162,900,000 | $ 167,900,000 | $ 324,600,000 | $ 326,100,000
Indirect leasing costs capitalized during period |  | 2,000,000 | $ 1,700,000 | 3,800,000 | $ 3,200,000
Future undiscounted minimum lease payments on ground leases |  | 507,959,000 |  | $ 507,959,000 |
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% |
Equity method investments |  | $ 190,000,000 |  | $ 190,000,000 |
Equity method investment agreement, defaulting penalty |  |  |  | $ 25,000,000 |
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Macerich, WSP, LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ownership Interest | 25.00% |  |  |  |
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Creative Office Space |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Area of real estate property, retail and entertainment space (in square feet) | ft² | 500 |  |  |  |
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Retail And Entertainment Space |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Area of real estate property, retail and entertainment space (in square feet) | ft² | 100 |  |  |  |
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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