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CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income $ 658,910 $ 207,293 $ 215,229  
Non-cash amortization of share-based compensation 40,960 37,624 32,813  
Contributions from noncontrolling interests in consolidated property partnerships 1,559 0 0  
Distributions to noncontrolling interests in consolidated property partnerships (27,601) (15,247) (12,952)  
Accounting Standards Update [Extensible List]       Accounting Standards Update 2016-02 [Member]
Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 30,766 20,188 19,786  
Contributions from noncontrolling interests in consolidated property partnerships 1,559      
Distributions to noncontrolling interests in consolidated property partnerships (27,601) (15,247) (12,952)  
Kilroy Realty L.P.        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 5,277,321 4,570,858 4,201,261  
Net income 658,910 207,293 215,229  
Issuance of common units   721,665 353,722  
Issuance of share-based compensation awards 3,921 4,441 4,664  
Non-cash amortization of share-based compensation 40,960 37,624 32,813  
Exercise of stock options 383   703  
Repurchase and cancellation of common units and restricted stock units (21,888) (14,082) (14,861)  
Contributions from noncontrolling interests in consolidated property partnerships 1,559 0 0  
Contributions from noncontrolling interests in consolidated property partnerships 1,559      
Contributions of noncontrolling interests in consolidated subsidiary   0    
Distributions to noncontrolling interests in consolidated property partnerships (27,601) (15,247) (12,952)  
Distributions declared per common unit (243,695) (235,231) (206,575)  
Ending balance $ 5,689,870 $ 5,277,321 4,570,858 $ 4,201,261
Accounting Standards Update [Extensible List]       Accounting Standards Update 2016-02 [Member]
Kilroy Realty L.P. | Cumulative Effect, Period of Adoption, Adjustment        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ (3,146)  
Ending balance       $ (3,146)
Kilroy Realty L.P. | Partners’ Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (in shares) 117,186,401 108,039,574 102,772,275  
Beginning balance $ 5,079,818 $ 4,369,758 $ 4,003,700  
Net income 634,307 $ 189,609 $ 198,738  
Issuance of common units (in shares)   8,897,110 5,000,000  
Issuance of common units   $ 721,665 $ 353,722  
Issuance of share-based compensation awards 3,921 4,441 4,664  
Non-cash amortization of share-based compensation $ 40,960 $ 37,624 $ 32,813  
Exercise of stock options (in shares) 9,000   16,500  
Exercise of stock options $ 383   $ 703  
Settlement of restricted stock units (in shares) 785,805 441,416 463,276  
Repurchase of common units and restricted stock units (in shares) (366,463) (191,699) (212,477)  
Repurchase and cancellation of common units and restricted stock units $ (21,888) $ (14,082) $ (14,861)  
Contributions from noncontrolling interests in consolidated property partnerships 0      
Contributions of noncontrolling interests in consolidated subsidiary   6,034    
Distributions declared per common unit (243,695) (235,231) (206,575)  
Ending balance $ 5,493,806 $ 5,079,818 $ 4,369,758 $ 4,003,700
Ending Balance (in shares) 117,614,743 117,186,401 108,039,574 102,772,275
Kilroy Realty L.P. | Partners’ Capital | Cumulative Effect, Period of Adoption, Adjustment        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ (3,146)  
Ending balance       $ (3,146)
Kilroy Realty L.P. | Noncontrolling Interests in Consolidated Property Partnerships and Subsidiaries        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 197,503 $ 201,100 197,561  
Net income 24,603 17,684 16,491  
Contributions from noncontrolling interests in consolidated property partnerships 1,559      
Contributions of noncontrolling interests in consolidated subsidiary   6,034    
Distributions to noncontrolling interests in consolidated property partnerships (27,601) (15,247) (12,952)  
Ending balance $ 196,064 $ 197,503 $ 201,100 $ 197,561