Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) (Kilroy Realty, L.P. [Member], USD $) In Thousands, except Share data, unless otherwise specified			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Series E Cumulative Redeemable Preferred Stock	Dec. 31, 2010 Series E Cumulative Redeemable Preferred Stock	Jun. 30, 2011 Series F Cumulative Redeemable Preferred Stock	Dec. 31, 2010 Series F Cumulative Redeemable Preferred Stock
Partners' Capital (Note 8):
Preferred stock dividend rate percentage			7.80%	7.80%	7.50%	7.50%
Preferred stock, shares outstanding			1,610,000	1,610,000	3,450,000	3,450,000
Preferred Stock Liquidation preference			$ 40,250	$ 40,250	$ 86,250	$ 86,250
General partner, units issued	58,464,412	52,349,670
General partners, units outstanding	58,464,412	52,349,670
Limited partners, units issued	1,718,131	1,723,131
Limited partnership units outstanding	1,718,131	1,723,131