Organization and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2014
Real Estate Properties [Line Items]
Rentable square feet	79,000
Kilroy Realty Finance, Inc. [Member]
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	1.00%
Development Properties [Member]
Real Estate Properties [Line Items]
Number of buildings	6	[1]
Rentable square feet	2,538,000	[1]
Office Properties [Member]
Real Estate Properties [Line Items]
Number of buildings	107
Rentable square feet	13,305,145
Number of Tenants	527
Percentage Occupied	92.40%

[1] Estimated rentable square feet upon completion.