v3.3.1.900
Preferred and Common Units of the Operating Partnership (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]            
Aggregate gross proceeds       $ 387,398 $ 102,229 $ 349,951
Aggregate net proceeds after sales agent compensation   $ 249,600        
Accrued distributions            
Accrued dividends and distributions   $ 34,992   $ 34,992 $ 32,899  
Summary of units            
Company owned general partnership interest   98.10%   98.10% 98.00%  
Noncontrolling common units of the Operating Partnership   1,764,775   1,764,775 1,804,200  
Ownership interest of noncontrolling interest   1.90%   1.90% 2.00%  
Restricted Stock Units (RSUs) [Member]            
Accrued distributions            
Accrued dividends and distributions   $ 427 [1]   $ 427 [1] $ 421 [2]  
Issuance of Equity under ATM Program [Member] | Partners Capital Common Unit [Member]            
Class of Stock [Line Items]            
Common units exchanged for share of common stock by the Company     1,040,838 1,866,267   1,599,123
Capital Units [Member]            
Accrued distributions            
Accrued dividends and distributions   618   $ 618 631  
Common Stock            
Accrued distributions            
Accrued dividends and distributions   32,291   $ 32,291 $ 30,191  
Common Stock | Issuance of Equity under ATM Program [Member]            
Class of Stock [Line Items]            
Share of common stock sold during the period       1,866,267 1,599,123 1,040,838
Aggregate gross proceeds       $ 140,100 $ 104,700 $ 55,300
Aggregate net proceeds after sales agent compensation       138,200 103,100 54,400
Kilroy Realty, L.P. [Member]            
Accrued distributions            
Accrued dividends and distributions   $ 34,992   $ 34,992 $ 32,899 32,899
Kilroy Realty, L.P. [Member] | Restricted Stock Units (RSUs) [Member]            
Accrued distributions            
Accrued dividends and distributions [1]           $ 421
Summary of units            
RSUs [3]   1,269,809   1,269,809   1,248,352
Kilroy Realty, L.P. [Member] | Partners Capital Common Unit [Member]            
Class of Stock [Line Items]            
Common units exchanged for share of common stock by the Company 6,175,000         7,210,838
Accrued distributions            
Accrued dividends and distributions   $ 33,336   $ 33,336   $ 31,243
Kilroy Realty, L.P. [Member] | Partners Capital General Partner [Member]            
Accrued distributions            
Accrued dividends and distributions   32,291   32,291   30,191
Kilroy Realty, L.P. [Member] | Partners Capital Limited Partner [Member]            
Accrued distributions            
Accrued dividends and distributions   618   618   631
Kilroy Realty, L.P. [Member] | Partners Capital Preferred Units [Member]            
Accrued distributions            
Accrued dividends and distributions   $ 1,656   $ 1,656   $ 1,656
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]            
Summary of units            
Preferred units outstanding   4,000,000   4,000,000   4,000,000
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]            
Summary of units            
Preferred units outstanding   4,000,000   4,000,000   4,000,000
Kilroy Realty, L.P. [Member] | Capital Units [Member]            
Summary of units            
Company owned common units in the Operating Partnership   92,258,690   92,258,690 86,259,684 86,259,684
[1] The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 13 “Share-Based Compensation” for additional information).
[2] The amount includes the value of the dividend equivalents that will be paid with additional RSUs (see Note 13 “Share-Based Compensation” for additional information)
[3] Does not include the 425,452 and 247,089 market measure-based RSUs because not all the necessary performance conditions have been met as of December 31, 2015 and 2014, respectively.