Consolidated Statements of Capital (KILROY REALTY, L.P.) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Interest rate on exchangeable notes		3.25%
Kilroy Realty, L.P. [Member]
Interest rate on exchangeable notes		3.25%
Distributions declared per common unit	$ 0.70	$ 0.70
Kilroy Realty, L.P. [Member] | Partner's Capital Common Unit [Member]
Interest rate on exchangeable notes		3.25%
Distributions declared per common unit	$ 0.70	$ 0.70
Kilroy Realty, L.P. [Member] | Total Partners Capital [Member]
Interest rate on exchangeable notes		3.25%
Distributions declared per common unit	$ 0.70	$ 0.70