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Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - Time-Based Restricted Stock Units (RSUs) [Member] - $ / shares
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 109,359      
Vested (in shares)   208,608 182,219 214,131
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) 543,848 543,848    
Granted (in shares)   120,769 153,005 437,216
Vested (in shares)   173,796    
Issuance of dividend equivalents (in shares)   15,523    
Forfeited (in shares)   (11,979)    
Number of RSUs outstanding, ending balance (in shares)   494,365 543,848  
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) $ 66.66 $ 66.66    
Fair value per share on valuation date (in dollars per share)   79.74 $ 70.31 $ 64.21
Weighted average grant date fair value, vested (in dollars per share)   70.83    
Weighted average fair value, issuance of dividend equivalents (in dollars per share)   61.80    
Weighted average fair value, forfeited (in dollars per share)   77.58    
RSU weighted average fair value, ending balance (in dollars per share)   $ 67.97 $ 66.66  
Vested 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]        
Vested RSUs, beginning balance (in shares) 1,071,378 1,071,378    
Granted (in shares)   0    
Vested (in shares)   173,796    
Settled (in shares)   (181,462)    
Issuance of dividend equivalents (in shares)   34,812    
Forfeited (in shares)   0    
Canceled (in shares)   (1,638)    
Vested RSUs, ending balance (in shares)   1,096,886 1,071,378  
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) 1,615,226 1,615,226    
Granted (in shares)   120,769    
Vested (in shares)   0    
Settled (in shares)   (181,462)    
Issuance of dividend equivalents (in shares)   50,335    
Forfeited (in shares)   (11,979)    
Canceled (in shares)   (1,638)    
Total RSUs, ending balance (in shares)   1,591,251 1,615,226  
Kilroy Realty 2006 Incentive Award Plan [Member] | Vested 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]        
Settled (in shares)   (67,316)