Name:	krc_DeferredCompensationArrangementWithIndividualEmployerContributionPercent
Namespace Prefix:	krc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The maximum percentage of directors and certain management employees bonuses and directors fees which may be deferred.

No definition available.

Name:	krc_DeferredCompensationDirectorsFeesAndEmployeeBonusesPercent
Namespace Prefix:	krc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The maximum percentage of certain management employees annual salaries that can be deferred.

No definition available.

Name:	krc_DeferredCompensationEmployeeSalaryPercent
Namespace Prefix:	krc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of each one dollar that the Company will contribute to an employees benefit plan up to a set percentage of their base salary.

No definition available.

Name:	krc_DefinedContributionPlanEmployerMatchingContributionPerParticipantDollar
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The number of months of service required before an employee is eligible to participate in the Company's 401(k) Plan.

No definition available.

Name:	krc_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix:	krc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

No definition available.

Name:	us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.