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Summary of Significant Accounting Policies - Narrative (Details)
ft² in Thousands
3 Months Ended
Mar. 01, 2018
ft²
Mar. 31, 2018
USD ($)
joint_venture
Mar. 31, 2017
USD ($)
Variable Interest Entity [Line Items]      
Rental revenue and tenant recoveries   $ 161,700,000 $ 158,300,000
Indirect leasing costs capitalized during period   1,800,000 $ 1,400,000
Future undiscounted minimum lease payments on ground leases   $ 449,315,000  
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  
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%