Consolidated Statements of Capital (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Kilroy Realty, L.P. [Member]
Distributions Per Limited Partnership and General Partnership Unit, Outstanding, Basic	$ 0.35	$ 0.35	$ 1.05	$ 1.05

Cash dividends declared or paid to each outstanding limited partnership and general partnership unit during the reporting period.

No definition available.

Name:	us-gaap_DistributionsPerLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration