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Net Income Available to Common Unitholders Per Unit of the Operating Partnership - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common unitholders |  |  |  |  |  |  |  |  | $ 187,105 | $ 195,443 | $ 258,415
Allocation to participating securities |  |  |  |  |  |  |  |  | (2,229) | (2,119) | (2,004)
Numerator for basic and diluted net income available to common stockholders |  |  |  |  |  |  |  |  | $ 184,876 | $ 193,324 | $ 256,411
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average vested shares/units outstanding (in shares/units) |  |  |  |  |  |  |  |  | 113,241,341 | 103,200,568 | 99,972,359
Effect of dilutive securities (in units) |  |  |  |  |  |  |  |  | 478,281 | 648,600 | 510,006
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares/units) |  |  |  |  |  |  |  |  | 113,719,622 | 103,849,168 | 100,482,365
Basic earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders per unit - basic (in dollars per unit) | $ 0.67 | $ 0.42 | $ 0.17 | $ 0.37 | $ 0.68 | $ 0.41 | $ 0.41 | $ 0.36 | $ 1.63 | $ 1.87 | $ 2.56
Diluted earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders per unit - diluted (in dollars per unit) | 0.67 | 0.42 | 0.17 | 0.37 | 0.67 | 0.41 | 0.41 | 0.36 | $ 1.63 | $ 1.86 | $ 2.55
Kilroy Realty L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common unitholders |  |  |  |  |  |  |  |  | $ 189,609 | $ 198,738 | $ 263,210
Allocation to participating securities |  |  |  |  |  |  |  |  | (2,229) | (2,119) | (2,004)
Numerator for basic and diluted net income available to common stockholders |  |  |  |  |  |  |  |  | $ 187,380 | $ 196,619 | $ 261,206
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average vested shares/units outstanding (in shares/units) |  |  |  |  |  |  |  |  | 115,095,506 | 105,223,975 | 102,025,276
Effect of dilutive securities (in units) |  |  |  |  |  |  |  |  | 478,281 | 648,600 | 510,006
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares/units) |  |  |  |  |  |  |  |  | 115,573,787 | 105,872,575 | 102,535,282
Basic earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders per unit - basic (in dollars per unit) | 0.67 | 0.42 | 0.16 | 0.37 | 0.68 | 0.41 | 0.41 | 0.36 | $ 1.63 | $ 1.87 | $ 2.56
Diluted earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income available to common unitholders per unit - diluted (in dollars per unit) | $ 0.67 | $ 0.42 | $ 0.16 | $ 0.36 | $ 0.67 | $ 0.41 | $ 0.41 | $ 0.36 | $ 1.62 | $ 1.86 | $ 2.55

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- Definition Basic and diluted net (loss) income available to common unitholders. + References No definition available. + Details
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