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Dispositions - Operating Property Dispositions (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) ft² property | Dec. 31, 2021 USD ($) ft² property | Mar. 31, 2021 USD ($) ft² property | Oct. 31, 2019 USD ($) ft² property | May 31, 2019 USD ($) ft² property | Dec. 31, 2021 USD ($) ft² property | Dec. 31, 2020 USD ($) ft² property | Dec. 31, 2019 USD ($) ft² property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Rentable square feet | ft² |  | 15,456,528 |  |  |  | 15,456,528 |  |
Gains on sales of operating properties | $ |  |  |  |  |  | $ 463,128 | $ 35,536 | $ 36,802
Disposal group, disposed of by sale | 2021 Dispositions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  | 3 |  |  |  | 3 |  |
Rentable square feet | ft² |  | 852,746 |  |  |  | 852,746 |  |
Proceeds from sale of property held-for-sale | $ |  |  |  |  |  | $ 1,118,500 |  |
Disposal group, disposed of by sale | 1800 Owens Street, San Francisco, CA (The Exchange on 16th) |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  |  | 1 |  |  |  |  |
Rentable square feet | ft² |  |  | 750,370 |  |  |  |  |
Proceeds from sale of property held-for-sale | $ |  |  | $ 1,081,500 |  |  |  |  |
Disposal group, disposed of by sale | 13280 & 13290 Evening Creek Drive South, San Diego, CA |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  | 2 |  |  |  | 2 |  |
Rentable square feet | ft² |  | 102,376 |  |  |  | 102,376 |  |
Proceeds from sale of property held-for-sale | $ |  | $ 37,000 |  |  |  |  |  |
Disposal group, disposed of by sale | 2020 Dispositions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property | 1 |  |  |  |  |  | 1 |
Rentable square feet | ft² | 87,147 |  |  |  |  |  | 87,147 |
Proceeds from sale of property held-for-sale | $ |  |  |  |  |  |  | $ 75,900 |
Disposal group, disposed of by sale | 331 Fairchild Drive, Mountain View, CA |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property | 1 |  |  |  |  |  | 1 |
Rentable square feet | ft² | 87,147 |  |  |  |  |  | 87,147 |
Proceeds from sale of property held-for-sale | $ | $ 75,900 |  |  |  |  |  |  |
Disposal group, disposed of by sale | 2019 Dispositions |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  |  |  |  |  |  |  | 2
Rentable square feet | ft² |  |  |  |  |  |  |  | 355,654
Proceeds from sale of property held-for-sale | $ |  |  |  |  |  |  |  | $ 133,800
Disposal group, disposed of by sale | 2829 Townsgate Road, Thousand Oaks, CA |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  |  |  |  | 1 |  |  |
Rentable square feet | ft² |  |  |  |  | 84,098 |  |  |
Proceeds from sale of property held-for-sale | $ |  |  |  |  | $ 18,300 |  |  |
Disposal group, disposed of by sale | 2211 Michelson Drive, Irvine, CA |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  |  |  | 1 |  |  |  |
Rentable square feet | ft² |  |  |  | 271,556 |  |  |  |
Proceeds from sale of property held-for-sale | $ |  |  |  | $ 115,500 |  |  |  |

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