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v3.20.4

Basis of Presentation and Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) property investment | Dec. 31, 2020 USD ($) property segment variable_interest_entity investment property_partnership | Dec. 31, 2019 USD ($) property property_partnership variable_interest_entity investment | Dec. 31, 2018 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of VIEs | variable_interest_entity |  | 2 | 4 |
Assets | $ 8,900,094,000 | $ 10,000,708,000 | $ 8,900,094,000 |
Liabilities | 4,329,236,000 | 4,723,387,000 | 4,329,236,000 |
Noncontrolling interest in consolidated subsidiary | $ 195,431,000 | $ 197,503,000 | $ 195,431,000 |
Number of equity method investments | investment | 0 | 0 | 0 |
Number of properties classified as held for sale | property | 0 | 0 | 0 |
Number of consolidated property partnerships | property_partnership |  | 3 |  |
Conversion ratio |  | 1 |  |
Income tax provision |  | $ 0 | $ 0 | $ 0
Number of operating segments | segment |  | 1 |  |
Washington [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of buildings | property |  | 8 |  |
Number of development projects | property |  | 1 |  |
Number of future development projects | property |  | 1 |  |
Building and building improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Depreciation of real estate |  | $ 244,800,000 | 211,900,000 | $ 198,600,000
Minimum [Member] | Building and building improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property depreciable lives |  | 25 years |  |
Minimum [Member] | Leasehold improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property depreciable lives |  | 1 year |  |
Maximum [Member] | Building and building improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property depreciable lives |  | 40 years |  |
Maximum [Member] | Leasehold improvements [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Property depreciable lives |  | 20 years |  |
Lease Agreements [Member] | Minimum [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 1 year |  |
Lease Agreements [Member] | Maximum [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Finite-lived intangible asset, useful life |  | 20 years |  |
Disposal group, disposed of by sale [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Restricted cash | $ 0 | $ 74,900,000 | $ 0 |
100 First LLC and 303 Second LLC [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of VIEs | property_partnership |  |  | 2 |
Number of buildings | property_partnership |  | 2 |  |
Section 1031 Exchange [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of VIEs | property | 2 |  |  |
Finance Partnership [Member] | Kilroy Realty Finance, Inc. [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Percentage of general partnership interest owned by wholly-owned subsidiary of the Company |  |  | 1.00% |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Assets | $ 676,700,000 | $ 469,300,000 | $ 676,700,000 |
Liabilities | 40,100,000 | 33,900,000 | 40,100,000 |
Variable Interest Entity, Primary Beneficiary [Member] | 100 First LLC and 303 Second LLC [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Noncontrolling interest in consolidated subsidiary | 189,600,000 | 191,900,000 | 189,600,000 |
Variable Interest Entity, Primary Beneficiary [Member] | Real estate investment [Member] |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Assets | $ 598,000,000.0 | $ 394,600,000 | $ 598,000,000.0 |

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