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Share-Based Compensation (Details Textual)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Feb. 14, 2018
USD ($)
$ / shares
Jan. 28, 2016
shares
Feb. 28, 2017
Feb. 28, 2018
shares
Sep. 30, 2018
USD ($)
plan
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
plan
shares
Sep. 30, 2017
USD ($)
Jan. 29, 2018
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of share-based incentive compensation plans | plan         1   1    
Share price | $ / shares                 $ 70.37
Share-based compensation expense | $         $ 8.1 $ 6.4 $ 24.7 $ 19.0  
Share-based compensation expense capitalized | $         1.5 $ 1.7 5.8 $ 5.4  
Share-based compensation not yet recognized | $         $ 24.3   $ 24.3    
Share-based compensation not yet recognized period of recognition             1 year 9 months    
2018 Performance-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period     3 years            
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs         100.00%   100.00%    
Vesting, Average debt to EBIDTA ratio, percentage of RSUs         50.00%   50.00%    
Vesting, Market measure, percentage of RSUs         50.00%   50.00%    
Number of shares issuable per RSU   1              
Fair value RSUs granted | $ $ 10.8                
Grant date fair value (in dollars per share) | $ / shares $ 70.08                
Share price | $ / shares $ 66.46                
Remaining expected life, including future volatility             5 years 10 months    
Expected life             2 years 11 months    
2018 Time-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period     3 years            
Right to receive number of shares (in shares)             1    
Fair value RSUs granted | $ $ 8.4                
Kilroy Realty 2006 Incentive Award Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for grant         1,800,000   1,800,000    
Chief Executive Officer [Member] | Kilroy Realty 2006 Incentive Award Plan [Member] | Market Measure-Based Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period       282,038          
Chief Executive Officer [Member] | Kilroy Realty 2006 Incentive Award Plan [Member] | 2018 Performance-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period       158,205     180,931    
Chief Executive Officer [Member] | Kilroy Realty 2006 Incentive Award Plan [Member] | 2018 Time-Based RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted in period       123,833