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Consolidated Statements of Capital (KILROY REALTY, L.P.) (Kilroy Realty, L.P. [Member], USD $)
In Thousands, except Share data
 6 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Partners Capital Preferred Units [Member]
Dec. 31, 2010
Partners Capital Preferred Units [Member]
Jun. 30, 2010
Partners Capital Preferred Units [Member]
Dec. 31, 2009
Partners Capital Preferred Units [Member]
Jun. 30, 2011
Partners Capital Common Unit [Member]
Jun. 30, 2010
Partners Capital Common Unit [Member]
Jun. 30, 2011
Total Partners Capital [Member]
Jun. 30, 2010
Total Partners Capital [Member]
Jun. 30, 2011
Noncontrolling Interest In Consolidated Subsidiaries [Member]
Jun. 30, 2010
Noncontrolling Interest In Consolidated Subsidiaries [Member]
Beginning Balance $ 1,117,730 $ 883,838 $ 121,582 $ 121,582 $ 121,582 $ 121,582 $ 994,511 $ 760,756 $ 1,116,093 $ 882,338 $ 1,637 $ 1,500
Beginning Balance units             54,072,801 44,871,893        
Net income 8,339 10,833         8,274 10,737 8,274 10,737 65 96
Issuance of common units, units (Note 8)             6,037,500 9,200,000        
Issuance of common units (Note 8) 221,015 299,847         221,015 299,847 221,015 299,847    
Issuance of share-based compensation awards, shares (Note 9)             68,727 3,239        
Issuance of share-based compensation awards (Note 9) 2,156 1,660         2,156 1,660 2,156 1,660    
Noncash amortization of share-based compensation 2,813 3,361         2,813 3,361 2,813 3,361    
Exercise of stock options 395 83         395 83 395 83    
Exercise of stock options, units             15,000 4,000        
Repurchase of common units and restricted stock units, units (Note 9)             (11,485) (59,782)        
Repurchase of common units and restricted stock units (Note 9) (732) (2,121)         (732) (2,121) (732) (2,121)    
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes   (2,694)           (2,694)   (2,694)    
Other               20   20   (20)
Preferred distributions and dividends (7,598) (7,598)         (7,598) (7,598) (7,598) (7,598)    
Distributions declared per common unit ($0.70 per unit) (40,585) (35,143)         (40,585) (35,143) (40,585) (35,143)    
Ending Balance $ 1,303,533 $ 1,152,066 $ 121,582 $ 121,582 $ 121,582 $ 121,582 $ 1,180,249 $ 1,028,908 $ 1,301,831 $ 1,150,490 $ 1,702 $ 1,576
Ending Balance units             60,182,543 54,019,350