Document and Entity Information - shares
6 Months Ended
Jun. 30, 2018
Aug. 03, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name MACERICH CO  
Entity Central Index Key 0000912242  
Document Type 10-Q  
Document Period End Date Jun. 30, 2018  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   141,050,902
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2