Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) - Kilroy Realty, L.P. [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Series G Cumulative Redeemable Preferred Units [Member]
Preferred units, issued	0	4,000,000
Preferred units, outstanding	0	4,000,000
Preferred stock dividend rate percentage	0.00%	6.875%
Preferred stock liquidation preference	$ 0	$ 100,000
Series H Cumulative Redeemable Preferred Units [Member]
Preferred units, issued	4,000,000	4,000,000
Preferred units, outstanding	4,000,000	4,000,000
Preferred stock dividend rate percentage	6.375%	6.375%
Preferred stock liquidation preference	$ 100,000	$ 100,000
Common Units [Member]
General partner, units issued	98,351,217	93,219,439
General partners, units outstanding	98,351,217	93,219,439
Limited partners, units issued	2,077,193	2,381,543
Noncontrolling common units of the Operating Partnership	2,077,193	2,381,543