Consolidated Statements of Capital (KILROY REALTY, L.P.) (Parenthetical) - $ / shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Kilroy Realty L.P. [Member]
Dividends declared per common unit (in dollars per unit)	$ 0.455	$ 0.425

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