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Partners' Capital of the Operating Partnership - At-The-Market Stock Offering, Common Units and Accrued Distributions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Aggregate net proceeds after selling commissions $ 0 $ 721,665 $ 353,722
Accrued distributions      
Accrued dividends and distributions 61,850 $ 59,431  
Issuance of Equity under ATM Program      
Class of Stock [Line Items]      
Shares of common stock contributed by the Company (in shares)   3,147,110  
Common units exchanged for shares of common stock by the Company (in shares)   3,147,110  
Aggregate net proceeds after selling commissions   $ 247,300  
Kilroy Realty L.P.      
Class of Stock [Line Items]      
Aggregate net proceeds after selling commissions 0 721,665 $ 353,722
Accrued distributions      
Accrued dividends and distributions 61,850 59,431  
Kilroy Realty L.P. | Restricted Stock Units (RSUs)      
Accrued distributions      
Accrued dividends and distributions $ 691 $ 838  
RSUs (in shares) 1,292,802 1,638,026  
Kilroy Realty L.P. | Market measure-based Restricted Stock Units (RSUs)      
Accrued distributions      
Number of RSUs outstanding (in shares) 976,464 873,709  
Kilroy Realty L.P. | Partners’ Capital      
Accrued distributions      
Accrued dividends and distributions $ 61,850 $ 59,431  
Kilroy Realty L.P. | Partners capital general partner      
Accrued distributions      
Accrued dividends and distributions 60,561 58,018  
Kilroy Realty L.P. | Partners capital limited partner      
Accrued distributions      
Accrued dividends and distributions $ 598 $ 575  
Kilroy Realty L.P. | Noncontrolling common unitholders of the Operating Partnership      
Summary of units      
Company owned common units in the Operating Partnership (in shares) 116,464,169 116,035,827  
Noncontrolling common units of the Operating Partnership (in shares) 1,150,574 1,150,574  
Non-Affiliated Investors | Noncontrolling common unitholders of the Operating Partnership      
Summary of units      
Noncontrolling common units of the Operating Partnership (in shares) 1,150,574 1,150,574  
Operating Partnership      
Summary of units      
Ownership interest (percent) 99.00% 99.00%  
Operating Partnership | Non-Affiliated Investors      
Summary of units      
Ownership interest (percent) 1.00% 1.00%