Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) (Kilroy Realty, L.P. [Member], USD $)					9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Common Units [Member]	Dec. 31, 2013 Common Units [Member]	Sep. 30, 2014 Series G Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2013 Series G Cumulative Redeemable Preferred Unit [Member]	Sep. 30, 2014 Series H Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2013 Series H Cumulative Redeemable Preferred Unit [Member]
Carrying amounts of consolidated VIE	$ 98,121,000	$ 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			83,388,220	82,153,944
General partners, units outstanding			83,388,220	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