v3.25.4
Stockholders' Equity of the Company - At-The-Market Offering and Derivatives and Distributions (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dividends and Distributions payable to:    
Accrued distributions $ 65,009 $ 64,850
Outstanding Shares and Units:    
Common stock (in shares) 118,372,451 118,046,674
Restricted Stock Units (RSUs)    
Outstanding Shares and Units:    
RSUs (in shares) 846,072 861,385
Kilroy Realty L.P.    
Dividends and Distributions payable to:    
Accrued distributions $ 65,009 $ 64,850
Kilroy Realty L.P. | Restricted Stock Units (RSUs)    
Dividends and Distributions payable to:    
Accrued distributions $ 476 $ 484
Kilroy Realty L.P. | Market measure-based Restricted Stock Units (RSUs)    
Outstanding Shares and Units:    
Number of RSUs outstanding (in shares) 1,394,111 926,695
Kilroy Realty L.P. | Common Units    
Outstanding Shares and Units:    
Noncontrolling common units ( in shares ) 1,133,562 1,150,574
Noncontrolling common units | Common Units    
Outstanding Shares and Units:    
Noncontrolling common units ( in shares ) 1,133,562 1,150,574
Common stockholders and noncontrolling unitholders    
Dividends and Distributions payable to:    
Accrued distributions $ 65,009 $ 64,850
Common stockholders    
Dividends and Distributions payable to:    
Accrued distributions $ 63,921 $ 63,745
Outstanding Shares and Units:    
Common stock (in shares) 118,372,451 118,046,674
Common Units    
Dividends and Distributions payable to:    
Accrued distributions $ 612 $ 621