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Stockholders' Equity of the Company Stockholders' Equity of the Company (Details) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 23, 2014
Dividends Payable [Line Items]        
Aggregate gross proceeds $ 102,229,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 349,951,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 672,102,000us-gaap_ProceedsFromIssuanceOfCommonStock  
Accrued dividend and distributions        
Accrued dividends and distributions 32,899,000us-gaap_DividendsPayableCurrentAndNoncurrent 31,490,000us-gaap_DividendsPayableCurrentAndNoncurrent    
Common Stockholders And Unitholders Dividends And Distributions Declared But Not Paid (31,243,000)krc_CommonStockholdersAndUnitholdersDividendsAndDistributionsDeclaredButNotPaid (29,378,000)krc_CommonStockholdersAndUnitholdersDividendsAndDistributionsDeclaredButNotPaid (26,863,000)krc_CommonStockholdersAndUnitholdersDividendsAndDistributionsDeclaredButNotPaid  
Summary of shares and units        
Common stock 86,259,684us-gaap_CommonStockSharesOutstanding [1] 82,153,944us-gaap_CommonStockSharesOutstanding [1]    
Noncontrolling common units 1,804,200us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 1,805,200us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding    
Common stockholders and noncontrolling unitholders [Member]        
Accrued dividend and distributions        
Accrued dividends and distributions   29,791,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= krc_CommonStockholdersAndNoncontrollingUnitholdersMember		    
Common Stock        
Dividends Payable [Line Items]        
Common Stock, Shares, Issued 86,259,684us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 82,153,944us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Accrued dividend and distributions        
Accrued dividends and distributions 30,191,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 28,754,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Summary of shares and units        
Common stock 86,259,684us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 82,153,944us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Capital Units [Member]        
Accrued dividend and distributions        
Accrued dividends and distributions 631,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CapitalUnitsMember		 632,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CapitalUnitsMember		    
Preferred Stock [Member]        
Accrued dividend and distributions        
Accrued dividends and distributions 1,656,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		 1,699,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		    
Series G Cumulative Redeemable Preferred Stock        
Summary of shares and units        
Preferred stock (in shares) 4,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember		 4,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesGPreferredStockMember		    
Series H Cumulative Redeemable Preferred Stock        
Summary of shares and units        
Preferred stock (in shares) 4,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesHPreferredStockMember		 4,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesHPreferredStockMember		    
Restricted Stock Units (RSUs) [Member]        
Accrued dividend and distributions        
Accrued dividends and distributions 421,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [2] 405,000us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [3]    
Time-Based Restricted Stock Units (RSUs) [Member]        
Summary of shares and units        
RSUs 1,248,352krc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber
/ us-gaap_AwardTypeAxis
= krc_TimeBasedRestrictedStockUnitsRsusMember		 [4] 1,158,407krc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber
/ us-gaap_AwardTypeAxis
= krc_TimeBasedRestrictedStockUnitsRsusMember		 [4]    
Issuance of Equity under ATM Program [Member] | Common Stock        
Dividends Payable [Line Items]        
Share of common stock sold during the period 1,599,123us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 1,040,838us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 787,118us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		  
Aggregate gross proceeds 104,700,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 55,300,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 37,000,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		  
Aggregate net proceeds after sales agent compensation 103,100,000krc_ProceedsfromIssuanceofCommonstocknet
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 54,400,000krc_ProceedsfromIssuanceofCommonstocknet
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		 36,300,000krc_ProceedsfromIssuanceofCommonstocknet
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ krc_StockOfferingProgramsbyProgramAxis
= krc_IssuanceOfEquityUnderAtmProgramMember		  
SFFGA [Member]        
Dividends Payable [Line Items]        
Common Stock, Shares, Issued       351,476us-gaap_CommonStockSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= krc_SFFGAMember
purchase price, value of shares issued to acquire land       $ 21,600,000krc_Purchasepricevalueofsharesissuedtoacquireland
/ us-gaap_BusinessAcquisitionAxis
= krc_SFFGAMember
[1] The amount includes nonvested shares.
[2] The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12 “Share-Based Compensation” for additional information).
[3] The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12 “Share-Based Compensation” for additional information)
[4] The amount includes nonvested RSUs. Does not include the 247,089 and 143,022 market measure-based RSUs since not all the necessary performance conditions have been met as of December 31, 2014 and 2013, respectively.