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Share-Based and Other Compensation - Summary of Performance and Market-Measure Based RSUs (Details) - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Settled (in shares) 0    
Market measure-based Restricted Stock Units (RSUs)      
Weighted-Average Fair Value Per Share      
Outstanding beginning balance ( in dollars per share) $ 52.47    
Granted ( in dollars per share) 35.67    
Vested (in dollars per share) 53.39    
Settled (in dollars per share) 0    
Issuance of dividend equivalents ( in dollars per share) 34.67    
Canceled (in dollars per share) 38.64    
Outstanding ending balance (in dollars per share) $ 42.49 $ 52.47  
Nonvested Restricted Stock Units RSU | Market measure-based Restricted Stock Units (RSUs)      
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) 1,083,086    
Granted (in shares) 416,451 483,113 310,484
Vested (in shares) 702,187    
Issuance of dividend equivalents (in shares) 48,673    
Canceled (in shares) (17,581)    
Number of RSUs outstanding, ending balance (in shares) 828,442 1,083,086  
Weighted-Average Fair Value Per Share      
Granted ( in dollars per share) $ 35.67 $ 39.65 $ 63.05
Vested Restricted Stock Units RSU      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Vested (in shares) 1,089,879 290,570 241,184
Vested Restricted Stock Units RSU | Market measure-based Restricted Stock Units (RSUs)      
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) 23,583    
Granted (in shares) 354,542    
Vested (in shares) 702,187    
Settled (in shares) (1,032,183)    
Issuance of dividend equivalents (in shares) 33,150    
Canceled (in shares) (5)    
Vested RSUs, ending balance (in shares) 81,274 23,583  
Restricted Stock Units (RSUs)      
Weighted-Average Fair Value Per Share      
Vesting period 3 years    
Restricted Stock Units (RSUs) | Market measure-based Restricted Stock Units (RSUs)      
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) 1,106,669    
Granted (in shares) 770,993    
Vested (in shares) 0    
Settled (in shares) (1,032,183)    
Issuance of dividend equivalents (in shares) 81,823    
Canceled (in shares) (17,586)    
Total RSUs, ending balance (in shares) 909,716 1,106,669  
Restricted Stock Units (RSUs) | Market measure-based Restricted Stock Units (RSUs) | Kilroy Realty 2006 Incentive Award Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Settled (in shares) (517,475)