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Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes Table (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 3,670,099 |  | $ 3,049,185 |
Unsecured debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount (premium), net | (8,300) |  | (6,500) |
Unamortized debt issuance expense | 21,600 |  | 18,700 |
Kilroy Realty L.P. [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized debt issuance expense | 22,400 |  |  |
Long-term debt, gross | 3,954,365 |  |  |
Unsecured debt, net | 3,670,099 |  | 3,049,185 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt, net | $ 3,670,099 |  | 2,899,839 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 2.500% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount (premium), net |  | $ (2,700) |  |
Stated interest rate | 2.50% |  |  |
Effective interest rate | 2.56% |  |  |
Long-term debt, gross | $ 425,000 |  | 0 |
Unamortized discount and deferred financing costs | (6,332) |  | 0 |
Unsecured debt, net | $ 418,668 |  | 0 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.270% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.27% |  |  |
Effective interest rate | 4.27% |  |  |
Long-term debt, gross | $ 350,000 |  | 0 |
Unamortized discount and deferred financing costs | (1,825) |  | 0 |
Unsecured debt, net | $ 348,175 |  | 0 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.050% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount (premium), net |  |  |  | $ (600)
Stated interest rate | 3.05% |  |  |
Effective interest rate | 3.064% |  |  |
Long-term debt, gross | $ 500,000 |  | 500,000 |
Unamortized discount and deferred financing costs | (5,399) |  | (5,998) |
Unsecured debt, net | $ 494,601 |  | 494,002 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.750% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.75% |  |  |
Effective interest rate | 4.80% |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |
Unamortized discount and deferred financing costs | (3,952) |  | (4,446) |
Unsecured debt, net | $ 396,048 |  | 395,554 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.350% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.35% |  |  |
Effective interest rate | 4.35% |  |  |
Long-term debt, gross | $ 200,000 |  | 200,000 |
Unamortized discount and deferred financing costs | (1,012) |  | (1,186) |
Unsecured debt, net | $ 198,988 |  | 198,814 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.300% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.30% |  |  |
Effective interest rate | 4.30% |  |  |
Long-term debt, gross | $ 50,000 |  | 50,000 |
Unamortized discount and deferred financing costs | (246) |  | (290) |
Unsecured debt, net | $ 49,754 |  | 49,710 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.450% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.45% |  |  |
Effective interest rate | 3.47% |  |  |
Long-term debt, gross | $ 425,000 |  | 425,000 |
Unamortized discount and deferred financing costs | (2,321) |  | (2,907) |
Unsecured debt, net | $ 422,679 |  | 422,093 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.450% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.45% |  |  |
Effective interest rate | 3.45% |  |  |
Long-term debt, gross | $ 75,000 |  | 75,000 |
Unamortized discount and deferred financing costs | (347) |  | (390) |
Unsecured debt, net | $ 74,653 |  | 74,610 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.350% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.35% |  |  |
Effective interest rate | 3.35% |  |  |
Long-term debt, gross | $ 175,000 |  | 175,000 |
Unamortized discount and deferred financing costs | (709) |  | (825) |
Unsecured debt, net | $ 174,291 |  | 174,175 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.375% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.375% |  |  |
Effective interest rate | 4.444% |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |
Unamortized discount and deferred financing costs | (2,631) |  | (3,185) |
Unsecured debt, net | $ 397,369 |  | 396,815 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 4.250% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.25% |  |  |
Effective interest rate | 4.35% |  |  |
Long-term debt, gross | $ 400,000 |  | 400,000 |
Unamortized discount and deferred financing costs | (4,567) |  | (5,100) |
Unsecured debt, net | $ 395,433 |  | 394,900 |
Kilroy Realty L.P. [Member] | Unsecured debt [Member] | 3.800% Unsecured Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.80% |  |  |
Effective interest rate | 3.80% |  |  |
Long-term debt, gross | $ 300,000 |  | 300,000 |
Unamortized discount and deferred financing costs | (560) |  | (834) |
Unsecured debt, net | $ 299,440 |  | $ 299,166 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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