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Share-Based Compensation - Summary of Time-Based RSUs 1 (Details) - Time-Based Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares) 214,131 228,095 130,784
Nonvested Restricted Stock Units RSU [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of RSUs outstanding, beginning balance (in shares) 331,546    
RSU weighted average fair value, beginning balance (in dollars per share) $ 66.83    
Granted (in shares) 437,216 142,101 173,747
Fair value per share on valuation date (in dollars per share) $ 64.21 $ 74.91 $ 58.29
Vested (in shares) 187,209    
Weighted average fair value, vested (in dollars per share) $ 63.85    
Issuance of dividend equivalents (in shares) 6,316    
Weighted average fair value, issuance of dividend equivalents (in dollars per share) $ 71.75    
Forfeited (in shares) (1,090)    
Weighted average fair value, forfeited (in dollars per share) $ 70.62    
Number of RSUs outstanding, ending balance (in shares) 586,779 331,546  
RSU weighted average fair value, ending balance (in dollars per share) $ 65.87 $ 66.83  
Vested Restricted Stock Units RSU [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested RSUs, beginning balance 1,080,928    
Granted (in shares) 0    
Vested (in shares) 187,209    
Settled (in shares) (202,536)    
Issuance of dividend equivalents (in shares) 26,922    
Forfeited (in shares) 0    
Canceled (in shares) (3,435)    
Vested RSUs, ending balance 1,089,088 1,080,928  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total RSUs, beginning balance (in shares) 1,412,474    
Granted (in shares) 437,216    
Vested (in shares) 0    
Settled (in shares) (202,536)    
Issuance of dividend equivalents (in shares) 33,238    
Forfeited (in shares) (1,090)    
Canceled (in shares) (3,435)    
Total RSUs, ending balance (in shares) 1,675,867 1,412,474  
Kilroy Realty 2006 Incentive Award Plan [Member] | Vested Restricted Stock Units RSU [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Settled (in shares) (85,598)