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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2020 USD ($) | Dec. 10, 2020 USD ($) | Dec. 18, 2019 USD ($) | Aug. 16, 2019 USD ($) | Jul. 25, 2019 USD ($) | Feb. 22, 2019 USD ($) | Aug. 31, 2018 USD ($) | Jul. 06, 2018 USD ($) ft² | Feb. 16, 2018 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 28, 2020 | Oct. 17, 2019 USD ($) | Sep. 12, 2019 USD ($) | Feb. 21, 2019 USD ($) | Sep. 06, 2018 ft² | Mar. 01, 2018 ft²
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Proceeds received in disposition of property |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 25,177,000 |  |  |  |  |  |
Outside partner interest of the operating partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%
Proceeds from sale |  |  |  |  |  |  | $ 142,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Sears South Plains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Replacement collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  | 37,294,000 |  |  |  |  |  |  |  |  |  |  |  |
Fashion District Philadelphia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
FlatIron Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  | $ 7,650,000 |  |  |  |  |  |  |  |
The Shops at Atlas Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 9,189,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fashion District Philadelphia | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | $ 2,773,000 |  |  |  |  |  |  |  |  |  |
The Market at Estrella Falls LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | $ 2,996,000 |  |  |  |  |  |  |  |  |  |  |
Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received in disposition of property |  |  |  |  |  |  |  |  |  |  | $ 19,300,000 | $ 0 | 0 |  |  |  |  |  |
Number of properties | property |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |
Joint venture | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease the mortgage note payable |  | $ 201,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of mortgage note payable |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease the mortgage note payable |  | $ 301,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repaid accrued interest percentage |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease the mortgage note payable |  | $ 201,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Replacement collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portfolio of marketable securities |  |  |  |  |  |  | 149,175,000 |  |  | $ 149,175,000 |  |  |  |  |  |  |  |  |
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 | HPP-MAC WSP, LLC—One Westside | Redevelopment construction loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 414,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 25,000,000 | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional borrowings |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Tysons Tower |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 190,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.38% |  |  |
Joint venture | Tysons Corner LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 95,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.43% |  |  |
Joint venture | Tysons Corner LLC | Initial Funding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Tysons Corner LLC | Future Advance Potential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Tysons Corner LLC | General Corporate Purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | FlatIron Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  | 3.85% |  |  |  |  |
Extension term | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | The Shops at Atlas Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan |  |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  | $ 57,751,000 |  |
Debt issued |  |  |  |  |  | $ 18,379,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | West Acres Development, LLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.72% |  |  |  |
Joint venture | Fashion District Philadelphia | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension term |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | Fashion District Philadelphia | Office building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  | 41,800,000 |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  |  | $ 5,545,000 |  |  |  |  |  |  |  |  |  |
Joint venture | Westside Pavilion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  | $ 46,242,000 |  |  |  |  |  | $ 46,242,000 |  |  |  |  |  |
Proceeds received in disposition of property |  |  |  |  |  |  |  |  |  | $ 142,500,000 |  |  |  |  |  |  |  |  |
Outside partner interest of the operating partnership |  |  |  |  |  |  | 75.00% |  |  | 75.00% |  |  | 75.00% |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  | $ 36,903,000 |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  |  | $ 105,597,000 |  |  |  |  |  |  |  |  |  |  |  |
Joint venture | The Market at Estrella Falls LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  |  |  |  | $ 12,598,000 |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  |  |  | 298 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | $ 49,100,000 |  |  |  |  |  |  |  |  |  |  |
Pay off of mortgage loans |  |  |  |  |  |  |  | $ 24,118,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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- Definition The increase (decrease) during the reporting period in the amount owed by the reporting entry in the form of loans and obligations (generally evidenced by promissory notes) made by the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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- Definition The cash inflow from sale of buildings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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