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Share-Based and Other Compensation - Summary of Market-Measure Based RSUs (Details) - $ / shares
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Award vesting period   3 years    
Market measure-based Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 154,267      
Vested (in shares)   (270,054) (265,737) (265,918)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
RSU weighted average fair value, beginning balance (in dollars per share) $ 71.04 $ 71.04    
Fair value per share on valuation date (in dollars per share)   85.08    
Weighted average grant date fair value, vested (in dollars per share)   74.71    
Weighted average fair value, issuance of dividend equivalents (in dollars per share)   62.21    
Weighted average fair value, forfeited (in dollars per share)   84.54    
RSU weighted average fair value, ending balance (in dollars per share)   $ 72.06 $ 71.04  
Market measure-based Restricted Stock Units (RSUs) [Member] | Nonvested Restricted Stock Units RSU [Member]        
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) 932,675 932,675    
Granted (in shares)   154,267 231,191 601,012
Vested (in shares)   (230,334)    
Issuance of dividend equivalents (in shares)   29,561    
Forfeited (in shares)   (12,460)    
Number of RSUs outstanding, ending balance (in shares)   873,709 932,675  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Fair value per share on valuation date (in dollars per share)   $ 85.08 $ 71.12 $ 68.51
Market measure-based Restricted Stock Units (RSUs) [Member] | Vested Restricted Stock Units R S U [Member]        
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) 36,679 36,679    
Granted (in shares)   38,313    
Vested (in shares)   (230,334)    
Settled (in shares)   (259,954)    
Issuance of dividend equivalents (in shares)   1,407    
Forfeited (in shares)   (4)    
Vested RSUs, ending balance (in shares)   46,775 36,679  
Market measure-based Restricted Stock Units (RSUs) [Member] | Restricted Stock Units (RSUs) [Member]        
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) 969,354 969,354    
Granted (in shares)   192,580    
Vested (in shares)   0    
Settled (in shares)   (259,954)    
Issuance of dividend equivalents (in shares)   30,968    
Forfeited (in shares)   (12,464)    
Total RSUs, ending balance (in shares)   920,484 969,354  
Kilroy Realty 2006 Incentive Award Plan [Member] | Market measure-based Restricted Stock Units (RSUs) [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Settled (in shares)   (125,928)