Number of variable interest entities in which the Company and the Operating Partnership are dermed to be the primary beneficiary.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of days the Company is obligated to complete the Section 1031 Exchange and take title to the acquired property.

+ Details

Name:	krc_NumberOfDaysToCompleteSection1031Exchange
Namespace Prefix:	krc
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of properties of the company located in Washington.

+ Details

Name:	krc_NumberOfPropertiesOfCompanyInAnotherState
Namespace Prefix:	krc
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of General partnership interest owned by wholly-owned subsidiary of the Company.

+ Details

Name:	krc_PercentageOfGeneralPartnershipInterestOwnedByWhollyOwnedSubsidiaryOfCompany
Namespace Prefix:	krc
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of limited partnership interest owned by Operating Partnership.

+ Details

Name:	krc_PercentageOfLimitedPartnershipInterestOwnedByOperatingPartnership
Namespace Prefix:	krc
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Rentable square feet.

+ Details

Name:	krc_RentableSquareFeet
Namespace Prefix:	krc
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Stabilized occupancy.

+ Details

Name:	krc_StabilizedOccupancy
Namespace Prefix:	krc
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshhold limits for segment reporting.

+ Details

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Namespace Prefix:	krc
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant