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Share-Based Compensation - Summary of Market-Measure Based RSUs 1 (Details) - $ / shares
12 Months Ended
Jan. 28, 2016
Jan. 27, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value per share on valuation date       $ 78.55  
Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSU weighted average fair value, beginning balance (per share)     $ 67.68    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period 168,077 127,657      
Fair value per share on valuation date     57.36 79.25 $ 64.86
Share-based compensation arrangement by share-based payment Award, equity instruments other than options, vested in period, weighted average grant date fair value     43.53    
Share based compensation arrangements, dividends, weighted average grant date fair value     65.50    
RSU weighted average fair value, ending balance (per share)     $ 64.95 $ 67.68  
Kilroy Realty, L.P. [Member] | Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of RSUs outstanding, beginning balance     425,452    
Number of RSUs outstanding, ending balance     659,051 425,452  
Nonvested Restricted Stock Units R S U [Member] | Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period     258,393 191,483 183,365
Share-based compensation arrangement by share-based payment Award, equity instruments other than options, vested in period     (36,914)    
Share based compensation arrangement by share based payment award equity instruments other than options issuance of dividend equivalents in period     12,120    
Number of RSUs outstanding, ending balance     659,051    
Vested Restricted Stock Units R S U [Member] | Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested RSUs, beginning balance     0    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period     0    
Share-based compensation arrangement by share-based payment Award, equity instruments other than options, vested in period     (36,914) 0 (16,338)
Share-based compensation arrangement by share-based payment award, equity instruments other than options, settled in period     (36,914)    
Share based compensation arrangement by share based payment award equity instruments other than options issuance of dividend equivalents in period     0    
Vested RSUs, ending balance     0 0  
Restricted Stock Units (RSUs) [Member] | Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total RSUs, beginning balance     425,452    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period     258,393    
Share-based compensation arrangement by share-based payment Award, equity instruments other than options, vested in period     0    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, settled in period     (36,914)    
Share based compensation arrangement by share based payment award equity instruments other than options issuance of dividend equivalents in period     12,120    
Total RSUs, ending balance     659,051 425,452  
Kilroy Realty 2006 Incentive Award Plan [Member] | Restricted Stock Units (RSUs) [Member] | Market measure-based Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, equity instruments other than options, settled in period     19,264