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Share-Based Compensation (Details Textual)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 28, 2016
USD ($)
$ / shares
shares
Jan. 09, 2016
USD ($)
shares
Mar. 31, 2016
USD ($)
plan
shares
Mar. 31, 2015
USD ($)
Jan. 08, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of share-based incentive compensation plans | plan     1    
Share-based compensation expense | $     $ 5.9 $ 4.3  
Share-based compensation expense capitalized | $     1.2 $ 0.7  
Share-based compensation not yet recognized | $     $ 44.1    
Share-based compensation not yet recognized period of recognition     2 years 1 month    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted 294,821        
2016 Performance Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted 168,077        
Percentage of shares granted 57.00%        
Vesting period 3 years        
RSUs expected to vest (in shares)     168,077    
Number of shares issuable per RSU 1        
Grant date fair value | $ $ 9.6        
Grant date fair value (in dollars per share) | $ / shares $ 57.08        
Remaining expected life 2 years 11 months        
2016 Time-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     126,744    
Percentage of shares granted 43.00%        
Vesting period 3 years        
Grant date fair value | $ $ 7.1        
Closing share price | $ / shares $ 56.23        
2016 Special RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted   33,910      
Vesting period 4 years        
Grant date fair value | $   $ 2.0      
Closing share price | $ / shares         $ 58.98
Kilroy Realty 2006 Incentive Award Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant     1,394,096