Name:	krc_AcquisitionRelatedIntangibleLiabilitiesNet
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Acquisition-related Intangible Liabilities, Net [Abstract]

No definition available.

Name:	krc_AcquisitionRelatedIntangibleLiabilitiesNetAbstract
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Deferred Leasing Costs and Acquisition-related Intangible Assets.

No definition available.

Name:	krc_DeferredLeasingCostsAndAcquisitionRelatedIntangibleAssetsAbstract
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This element represents (1) costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction; (2) the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date; and (3) the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. This element is net of accumulated amortization.

No definition available.

Name:	krc_DeferredLeasingCostsAndAcquisitionRelatedIntangibleAssetsNet
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
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Accumulated amount of amortization of intangible liabilities with a finite life.

No definition available.

Name:	krc_Finitelivedintangibleliabilitiesaccumulatedamortization
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount before amortization of intangible liabilities with a finite life.

No definition available.

Name:	krc_Finitelivedintangibleliabilitiesgross
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount after amortization of intangible liabilities witth a finite life.

No definition available.

Name:	krc_Finitelivedintangibleliabilitiesnet
Namespace Prefix:	krc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	krc_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis=krc_DeferredLeasingCostsMember
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Period Type:

Name:	krc_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis=us-gaap_AboveMarketLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	krc_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis=us-gaap_LeasesAcquiredInPlaceMember
Namespace Prefix:
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Period Type:

Name:	krc_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis=krc_LeasesAcquiredInPlaceBelowMarketGroundLeaseAdjustmentMember
Namespace Prefix:
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Name:	krc_FiniteLivedIntangibleAssetsAndLiabilitiesByMajorClassAxis=krc_BelowMarketLeaseMember
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