CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 65,230	$ 59,383
Non-cash amortization of share-based compensation	11,566	6,598
Settlement of restricted stock units	0	0
Distributions to noncontrolling interests in consolidated property partnerships	(7,068)	(14,842)
Noncontrolling Interests in Consolidated Property Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	8,622	6,255
Distributions to noncontrolling interests in consolidated property partnerships	(7,068)	(14,842)
Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	5,674,961	5,689,870
Net income	65,230	59,383
Issuance of share-based compensation awards	1,365	1,942
Non-cash amortization of share-based compensation	11,566	6,598
Settlement of restricted stock units	0	0
Repurchase of common units and restricted stock units	(8,363)	(13,994)
Distributions to noncontrolling interests in consolidated property partnerships	(7,068)	(14,842)
Distributions declared per common unit	(65,269)	(63,196)
Ending balance	$ 5,672,422	$ 5,665,761
Kilroy Realty L.P. | Partners’ Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	118,028,605	117,614,743
Beginning balance	$ 5,490,571	$ 5,493,806
Net income	57,168	53,644
Issuance of share-based compensation awards	1,365	1,942
Non-cash amortization of share-based compensation	$ 11,566	$ 6,598
Settlement of restricted stock units (in shares)	445,973	459,050
Repurchase of common units and restricted stock units (in shares)	(203,042)	(207,139)
Repurchase of common units and restricted stock units	$ (8,363)	$ (13,994)
Distributions declared per common unit	$ (65,269)	$ (63,196)
Ending balance (in shares)	118,271,536	117,866,654
Ending balance	$ 5,487,038	$ 5,478,800
Kilroy Realty L.P. | Noncontrolling Interests in Consolidated Property Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	184,390	196,064
Net income	8,062	5,739
Distributions to noncontrolling interests in consolidated property partnerships	(7,068)	(14,842)
Ending balance	$ 185,384	$ 186,961