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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 14, 2017 USD ($) | Sep. 18, 2017 USD ($) | Mar. 17, 2017 USD ($) | Mar. 28, 2016 USD ($) | Mar. 01, 2016 USD ($) ft² | Jan. 14, 2016 USD ($) ft² | Jan. 06, 2016 USD ($) ft² | Oct. 30, 2015 USD ($) ft² | Apr. 30, 2015 USD ($) store | Feb. 17, 2015 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  | $ 33,825 | $ (375) | $ 9,850
Gain on sale of assets |  |  |  |  |  |  |  |  |  |  | 42,446 | 415,348 | 378,248
Gain on land sales |  |  |  |  |  |  |  |  |  |  | $ 1,564 | 4,546 | $ 1,807
PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  | $ 713,000 |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | 1,258,643 |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  | 311,194 |  |  |  |  |
Cash payment |  |  |  |  |  |  |  | $ 545,643 |  |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  | 1,197 |  |  |  |  |  |
Ownership % |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  | $ 289,496 |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  | $ 101,629 |
Cash payment |  |  |  |  |  |  | 129,496 |  |  |  |  |  |
Assumption of debt |  |  |  |  |  |  | 160,000 |  |  |  |  |  |
Westcor/Queen Creek LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on land sales | $ 5,436 |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  | $ 101,629 |  |  |  |  |  |
Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership % |  |  |  |  |  | 49.00% |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  | $ 771,478 |  |  |  |  |  |  |
Cash payment |  |  |  |  |  | 478,608 |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  | 340,734 |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  | $ 292,870 |  |  |  |  |  |  |
Joint venture | Westcor/Queen Creek LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Land sold | 30,491 |  |  |  |  |  |  |  |  |  |  |  |
Gain on land sales | $ 14,853 |  |  |  |  |  |  |  |  |  |  |  |
Lakewood Center | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 2,070 |  |  |  |  |
Los Cerritos Center | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 1,305 |  |  |  |  |
South Plains Mall | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 1,128 |  |  |  |  |
Washington Square | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 1,442 |  |  |  |  |
Deptford Mall | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  | 1,040 |  |  |  |  |  |  |
FlatIron Crossing | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  | 1,433 |  |  |  |  |  |  |
Twenty Ninth Street | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  | 847 |  |  |  |  |  |  |
Inland Center |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage purchased |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  | 869 |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  |  | $ 51,250 |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  |  | 26,250 |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  |  |  | 25,000 |  |  |
Loan paid off |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |
Sears |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |
Ownership % |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Number of stores | store |  |  |  |  |  |  |  |  | 9 |  |  |  |
Joint venture ownership percentage purchased |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Country Club Plaza | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 1,001 |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  | $ 660,000 |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  | $ 320,000 | $ 330,000 |  |  |  |  |  |  |  |
Joint venture ownership percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.88% |  |  |  |  |  |  |  |  |
Pacific Premier Retail LLC—Various Properties |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership % |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Pacific Premier Retail LLC—Various Properties | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership % |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Office building | Country Club Plaza |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  | $ 2,290 |  |  |  |  |  |  |  |  |  |
Office building | Country Club Plaza | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  | 78,000 |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  | $ 4,580 |  |  |  |  |  |  |  |  |  |
Office building | Fashion District Philadelphia—Various Entities |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  | $ 6,539 |  |  |  |  |  |  |  |  |  |  |
Office building | Fashion District Philadelphia—Various Entities | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  | 61,500 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  | $ 13,078 |  |  |  |  |  |  |  |  |  |  |

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