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Investments in Unconsolidated Joint Ventures: Company Ownership (Details)	Dec. 31, 2015	Feb. 17, 2015
443 Wabash MAB LLC
Investments in unconsolidated joint ventures:
Ownership %	45.00%
AM Tysons LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Biltmore Shopping Center Partners LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Candlestick Center LLC—Fashion Outlets of San Francisco
Investments in unconsolidated joint ventures:
Ownership %	50.10%
Coolidge Holding LLC
Investments in unconsolidated joint ventures:
Ownership %	37.50%
Corte Madera Village, LLC
Investments in unconsolidated joint ventures:
Ownership %	50.10%
Fashion Outlets of Philadelphia—Various Entities
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Jaren Associates 4
Investments in unconsolidated joint ventures:
Ownership %	12.50%
Kierland Commons Investment LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Macerich Northwestern Associates—Broadway Plaza
Investments in unconsolidated joint ventures:
Ownership %	50.00%
MS Portfolio LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
North Bridge Chicago LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
One Scottsdale Investors LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Pacific Premier Retail LLC—Various Properties
Investments in unconsolidated joint ventures:
Ownership %	60.00%
Propcor II Associates, LLC—Boulevard Shops
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Scottsdale Fashion Square Partnership
Investments in unconsolidated joint ventures:
Ownership %	50.00%
The Market at Estrella Falls LLC
Investments in unconsolidated joint ventures:
Ownership %	40.10%
Tysons Corner LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Tysons Corner Hotel I LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Tysons Corner Property Holdings II LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Tysons Corner Property LLC
Investments in unconsolidated joint ventures:
Ownership %	50.00%
West Acres Development, LLP
Investments in unconsolidated joint ventures:
Ownership %	19.00%
Westcor/Gilbert, L.L.C.
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Westcor/Queen Creek LLC
Investments in unconsolidated joint ventures:
Ownership %	38.00%
Westcor/Surprise Auto Park LLC
Investments in unconsolidated joint ventures:
Ownership %	33.30%
WMAP, L.L.C.—Atlas Park
Investments in unconsolidated joint ventures:
Ownership %	50.00%
Inland Center
Investments in unconsolidated joint ventures:
Additional ownership interest (as a percent)		50.00%

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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