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CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (Decrease) in Partners' Capital [Roll Forward]                
Net income $ 162,282 $ 79,568 $ 43,681 $ 57,673 $ 54,547 $ 55,700 $ 285,531 $ 167,920
Non-cash amortization of share-based compensation (Note 8) 6,842 5,670 5,176 6,682 6,942 4,727    
Settlement of restricted stock units for shares of common stock 0 0 0 0 0 0    
Distributions to noncontrolling interests in consolidated property partnerships (11,996) (7,074) (7,234) (4,629) (5,911) (6,898)    
Noncontrolling Interests in Consolidated Property Partnerships                
Increase (Decrease) in Partners' Capital [Roll Forward]                
Net income 6,062 11,119 4,673 5,295 5,336 5,780    
Distributions to noncontrolling interests in consolidated property partnerships (11,996) (7,074) (7,234) (4,629) (5,911) (6,898)    
Kilroy Realty L.P.                
Increase (Decrease) in Partners' Capital [Roll Forward]                
Beginning balance 5,593,444 5,579,985 5,608,869 5,634,258 5,642,731 5,659,693 5,608,869 5,659,693
Net income 162,282 79,568 43,681 57,673 54,547 55,700 285,531 167,920
Issuance of share-based compensation awards 480 477 1,476 1,107 1,085 4,017    
Non-cash amortization of share-based compensation (Note 8) 6,842 5,670 5,176 6,682 6,942 4,727    
Settlement of restricted stock units for shares of common stock 0 0 0 0 0 0    
Repurchase of common units and restricted stock units (213) (197) (6,009) (21,718) (20) (5,898)    
Distributions to noncontrolling interests in consolidated property partnerships (11,996) (7,074) (7,234) (4,629) (5,911) (6,898)    
Distributions declared per common unit ($0.54 per unit) (64,984) (64,985) (65,974) (64,833) (65,116) (68,610)    
Ending balance $ 5,685,855 $ 5,593,444 $ 5,579,985 $ 5,608,540 $ 5,634,258 $ 5,642,731 $ 5,685,855 $ 5,608,540
Kilroy Realty L.P. | Partners’ Capital                
Increase (Decrease) in Partners' Capital [Roll Forward]                
Beginning balance (in shares) 119,444,902 119,419,333 119,197,248 118,535,805 118,516,979 118,390,132 119,197,248 118,390,132
Beginning balance $ 5,418,647 $ 5,408,570 $ 5,434,518 $ 5,458,654 $ 5,466,094 $ 5,481,436 $ 5,434,518 $ 5,481,436
Net income 157,744 69,112 39,383 52,887 49,669 50,422    
Issuance of share-based compensation awards 480 477 1,476 1,107 1,085 4,017    
Non-cash amortization of share-based compensation (Note 8) $ 6,842 $ 5,670 $ 5,176 $ 6,682 $ 6,942 $ 4,727    
Settlement of restricted stock units (in shares) 14,634 31,774 377,801 1,249,236 19,395 217,496    
Repurchase of common units and restricted stock units (in shares) (4,883) (6,205) (155,716) (587,793) (569) (90,649)    
Repurchase of common units and restricted stock units $ (213) $ (197) $ (6,009) $ (21,718) $ (20) $ (5,898)    
Distributions declared per common unit ($0.54 per unit) $ (64,984) $ (64,985) $ (65,974) $ (64,833) $ (65,116) $ (68,610)    
Ending balance (in shares) 119,454,653 119,444,902 119,419,333 119,197,248 118,535,805 118,516,979 119,454,653 119,197,248
Ending balance $ 5,518,516 $ 5,418,647 $ 5,408,570 $ 5,432,779 $ 5,458,654 $ 5,466,094 $ 5,518,516 $ 5,432,779
Kilroy Realty L.P. | Noncontrolling Interests in Consolidated Property Partnerships                
Increase (Decrease) in Partners' Capital [Roll Forward]                
Beginning balance 174,797 171,415 174,351 175,604 176,637 178,257 174,351 178,257
Net income 4,538 10,456 4,298 4,786 4,878 5,278    
Distributions to noncontrolling interests in consolidated property partnerships (11,996) (7,074) (7,234) (4,629) (5,911) (6,898)    
Ending balance $ 167,339 $ 174,797 $ 171,415 $ 175,761 $ 175,604 $ 176,637 $ 167,339 $ 175,761