Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) (Kilroy Realty, L.P. [Member], USD $)					3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Common Units [Member]	Dec. 31, 2013 Common Units [Member]	Mar. 31, 2014 Series G Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2013 Series G Cumulative Redeemable Preferred Unit [Member]	Mar. 31, 2014 Series H Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2013 Series H Cumulative Redeemable Preferred Unit [Member]
Variable Interest Entity Consolidated Carrying Amounts, Real Estate Assets, net	$ 60,575,000	$ 234,532,000
Preferred Units, Issued					4,000,000	4,000,000	4,000,000	4,000,000
Preferred Units, Outstanding					4,000,000	4,000,000	4,000,000	4,000,000
Preferred stock dividend rate percentage					6.875%	6.875%	6.375%	6.375%
Preferred Stock Liquidation preference					$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000
General partner, units issued			82,218,332	82,153,944
General partners, units outstanding			82,218,332	82,153,944
Limited partners, units issued			1,804,200	1,805,200
Common units held by limited partners			1,804,200	1,805,200