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Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2013
Jun. 30, 2015
Kilroy Realty, L.P. [Member]    
Variable Interest Entity Consolidated Carrying Amounts, Real Estate Assets, net $ 234,532 $ 211,755
Kilroy Realty, L.P. [Member] | Capital Units [Member]    
General Partners' Capital Account, Units Issued 86,259,684 92,258,690
General Partners' Capital Account, Units Outstanding 86,259,684 92,258,690
Limited Partners' Capital Account, Units Issued 1,804,200 1,764,775
Noncontrolling common units of the Operating Partnership 1,804,200 1,764,775
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]    
Preferred stock dividend rate (percentage) 6.875%  
Preferred Units, Issued 4,000,000 4,000,000
Preferred units outstanding 4,000,000  
Preferred stock liquidation preference $ 100,000 $ 100,000
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]    
Preferred stock dividend rate (percentage) 6.375%  
Preferred Units, Issued 4,000,000 4,000,000
Preferred units outstanding 4,000,000  
Preferred stock liquidation preference $ 100,000 $ 100,000