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Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - Time-Based Restricted Stock Units (RSUs) [Member] - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted (in shares) | 109,359 |  |  |
Vested (in shares) |  | 208,608 | 182,219 | 214,131
Nonvested Restricted Stock Units RSU [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Number of RSUs outstanding, beginning balance (in shares) | 543,848 | 543,848 |  |
Granted (in shares) |  | 120,769 | 153,005 | 437,216
Vested (in shares) |  | 173,796 |  |
Issuance of dividend equivalents (in shares) |  | 15,523 |  |
Forfeited (in shares) |  | (11,979) |  |
Number of RSUs outstanding, ending balance (in shares) |  | 494,365 | 543,848 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |
RSU weighted average fair value, beginning balance (in dollars per share) | $ 66.66 | $ 66.66 |  |
Fair value per share on valuation date (in dollars per share) |  | 79.74 | $ 70.31 | $ 64.21
Weighted average grant date fair value, vested (in dollars per share) |  | 70.83 |  |
Weighted average fair value, issuance of dividend equivalents (in dollars per share) |  | 61.80 |  |
Weighted average fair value, forfeited (in dollars per share) |  | 77.58 |  |
RSU weighted average fair value, ending balance (in dollars per share) |  | $ 67.97 | $ 66.66 |
Vested Restricted Stock Units RSU [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Vested RSUs, beginning balance (in shares) | 1,071,378 | 1,071,378 |  |
Granted (in shares) |  | 0 |  |
Vested (in shares) |  | 173,796 |  |
Settled (in shares) |  | (181,462) |  |
Issuance of dividend equivalents (in shares) |  | 34,812 |  |
Forfeited (in shares) |  | 0 |  |
Canceled (in shares) |  | (1,638) |  |
Vested RSUs, ending balance (in shares) |  | 1,096,886 | 1,071,378 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Total RSUs, beginning balance (in shares) | 1,615,226 | 1,615,226 |  |
Granted (in shares) |  | 120,769 |  |
Vested (in shares) |  | 0 |  |
Settled (in shares) |  | (181,462) |  |
Issuance of dividend equivalents (in shares) |  | 50,335 |  |
Forfeited (in shares) |  | (11,979) |  |
Canceled (in shares) |  | (1,638) |  |
Total RSUs, ending balance (in shares) |  | 1,591,251 | 1,615,226 |
Kilroy Realty 2006 Incentive Award Plan [Member] | Vested Restricted Stock Units RSU [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Settled (in shares) |  | (67,316) |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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