CONSOLIDATED STATEMENTS OF CAPITAL (KILROY REALTY, L.P.) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	$ 59,383	$ 507,411
Non-cash amortization of share-based compensation (Note 7)	6,598	9,604
Distributions to noncontrolling interests in consolidated property partnerships	(14,842)	(11,680)
Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	5,689,870	5,277,321
Net income	59,383	507,411
Issuance of share-based compensation awards	1,942	1,950
Non-cash amortization of share-based compensation (Note 7)	6,598	9,604
Repurchase of common units and restricted stock units	(13,994)	(21,137)
Distributions to noncontrolling interests in consolidated property partnerships	(14,842)	(11,680)
Distributions declared per common unit	(63,196)	(60,577)
Ending balance	$ 5,665,761	$ 5,702,892
Partners’ Capital | Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	117,614,743	117,186,401
Beginning balance	$ 5,493,806	$ 5,079,818
Net income	53,644	502,517
Issuance of share-based compensation awards	1,942	1,950
Non-cash amortization of share-based compensation (Note 7)	$ 6,598	$ 9,604
Settlement of restricted stock units (in shares)	459,050	769,701
Repurchase of common units, stock options and restricted stock units (in shares)	(207,139)	(355,158)
Repurchase of common units and restricted stock units	$ (13,994)	$ (21,137)
Distributions declared per common unit	$ (63,196)	$ (60,577)
Ending balance (in shares)	117,866,654	117,600,944
Ending balance	$ 5,478,800	$ 5,512,175
Noncontrolling Interests in Consolidated Property Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	6,255	9,780
Distributions to noncontrolling interests in consolidated property partnerships	(14,842)	(11,680)
Noncontrolling Interests in Consolidated Property Partnerships | Kilroy Realty L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	196,064	197,503
Net income	5,739	4,894
Distributions to noncontrolling interests in consolidated property partnerships	(14,842)	(11,680)
Ending balance	$ 186,961	$ 190,717