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Investments in Unconsolidated Joint Ventures: Company Ownership (Details) | Dec. 31, 2015 | Feb. 17, 2015
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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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