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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net income attributable to common unitholders $ 628,144 $ 187,105 $ 195,443
Allocation to participating securities (1,516) (2,229) (2,119)
Numerator for basic and diluted net income available to common stockholders $ 626,628 $ 184,876 $ 193,324
Denominator:      
Basic weighted average vested shares/units outstanding (in shares/units) 116,429,130 113,241,341 103,200,568
Effect of dilutive securities (in units) 519,513 478,281 648,600
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares/units) 116,948,643 113,719,622 103,849,168
Basic earnings per share:      
Net income available to common unitholders per unit - basic (in dollars per unit) $ 5.38 $ 1.63 $ 1.87
Diluted earnings per share:      
Net income available to common unitholders per unit - diluted (in dollars per unit) $ 5.36 $ 1.63 $ 1.86
Kilroy Realty L.P.      
Numerator:      
Net income attributable to common unitholders $ 634,307 $ 189,609 $ 198,738
Allocation to participating securities (1,516) (2,229) (2,119)
Numerator for basic and diluted net income available to common stockholders $ 632,791 $ 187,380 $ 196,619
Denominator:      
Basic weighted average vested shares/units outstanding (in shares/units) 117,579,704 115,095,506 105,223,975
Effect of dilutive securities (in units) 519,513 478,281 648,600
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares/units) 118,099,217 115,573,787 105,872,575
Basic earnings per share:      
Net income available to common unitholders per unit - basic (in dollars per unit) $ 5.38 $ 1.63 $ 1.87
Diluted earnings per share:      
Net income available to common unitholders per unit - diluted (in dollars per unit) $ 5.36 $ 1.62 $ 1.86