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Share-Based and Other Compensation - Summary of Performance and Market-Measure Based RSUs (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Market measure-based Restricted Stock Units (RSUs)      
Weighted-Average Fair Value Per Share      
Outstanding beginning balance ( in dollars per share) $ 66.85    
Granted ( in dollars per share) 39.65    
Vested (in dollars per share) 76.67    
Issuance of dividend equivalents ( in dollars per share) 32.98    
Canceled (in dollars per share) 61.00    
Outstanding ending balance (in dollars per share) $ 52.47 $ 66.85  
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) 1,123,554    
Granted (in shares) 483,113 310,484 281,333
Vested (in shares) 230,741    
Issuance of dividend equivalents (in shares) 67,122    
Canceled (in shares) (359,962)    
Number of RSUs outstanding, ending balance (in shares) 1,083,086 1,123,554  
Weighted-Average Fair Value Per Share      
Granted ( in dollars per share) $ 39.65 $ 63.05 $ 57.85
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) 290,570 241,184 252,098
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) 29,705    
Granted (in shares) 53,537    
Vested (in shares) 230,741    
Settled (in shares) (296,688)    
Issuance of dividend equivalents (in shares) 6,292    
Canceled (in shares) (4)    
Vested RSUs, ending balance (in shares) 23,583 29,705  
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) 1,153,259    
Granted (in shares) 536,650    
Vested (in shares) 0    
Settled (in shares) (296,688)    
Issuance of dividend equivalents (in shares) 73,414    
Canceled (in shares) (359,966)    
Total RSUs, ending balance (in shares) 1,106,669 1,153,259  
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) 144,178