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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |
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Dec. 18, 2019 USD ($) | Aug. 16, 2019 USD ($) | Jul. 25, 2019 USD ($) | Aug. 31, 2018 USD ($) | Jul. 06, 2018 USD ($) ft² | Feb. 16, 2018 USD ($) | Dec. 14, 2017 USD ($) | Sep. 18, 2017 USD ($) | Mar. 17, 2017 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 12, 2019 USD ($) | Sep. 06, 2018 ft² | Mar. 01, 2018 ft²
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Proceeds received in disposition of property |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 25,177 | $ 0 |  |  |
Outside partner interest of the operating partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Proceeds from sale |  |  |  | $ 142,500 |  |  |  |  |  |  |  |  |  |  |  |
Replacement collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | 37,294 |  |  |  |  |  |  |  |  |  |  |  |
Country Club Plaza | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | $ 2,290 |  |  |  |  |  |  |
Fashion District Philadelphia—Various Entities | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  | $ 2,773 |  | $ 6,539 |  |  |  |  |  |  |  |
Westcor/Queen Creek LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on land sales |  |  |  |  |  |  | $ 5,436 |  |  |  |  |  |  |  |  |
The Market at Estrella Falls LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  | $ 2,996 |  |  |  |  |  |  |  |  |  |  |
Joint venture | Replacement collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portfolio of marketable securities |  |  |  | 149,175 |  |  |  |  |  | $ 149,175 |  |  |  |  |  |
Joint venture | Los Angeles Premium Outlets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5000.00% |
Property area (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |
Joint venture | Los Angeles Premium Outlets | Simon Property Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Joint venture | Los Angeles Premium Outlets, second stage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165 |
Joint venture | Tysons Tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 190,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.38% |  |
Joint venture | HPP-MAC WSP, LLC—One Westside | Redevelopment construction loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 414,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | HPP-MAC WSP, LLC—One Westside | LIBOR | Redevelopment construction loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread, contingent (as a percent) | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Westside Pavilion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Property area (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680
Joint venture | Westside Pavilion | Hudson Pacific Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Joint venture | Fashion District Philadelphia—Various Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional borrowings |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  | $ 25,000 | $ 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia—Various Entities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Country Club Plaza | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  | 78,000 |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | $ 4,580 |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia—Various Entities | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  | 41,800 |  | 61,500 |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  | $ 5,545 |  | $ 13,078 |  |  |  |  |  |  |  |
Joint venture | Westcor/Queen Creek LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of land |  |  |  |  |  |  | 30,491 |  |  |  |  |  |  |  |  |
Gain on land sales |  |  |  |  |  |  | $ 14,853 |  |  |  |  |  |  |  |  |
Joint venture | Westside Pavilion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  | $ 46,242 |  |  |  |  |  |  |  | $ 46,242 |  |  |  |
Proceeds received in disposition of property |  |  |  |  |  |  |  |  |  | $ 142,500 |  |  |  |  |  |
Outside partner interest of the operating partnership |  |  |  | 75.00% |  |  |  |  |  | 75.00% |  | 75.00% |  |  |  |
Proceeds from sale |  |  |  | $ 36,903 |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  | $ 105,597 |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | The Market at Estrella Falls LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  | $ 12,598 |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  | 298 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 49,100 |  |  |  |  |  |  |  |  |  |  |
Pay off of mortgage loans |  |  |  |  | $ 24,118 |  |  |  |  |  |  |  |  |  |  |

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