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Quarterly Financial Information of the Company (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
 [1]
Sep. 30, 2015
 [1]
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [1]
Dec. 31, 2014
 [1]
Sep. 30, 2014
 [1]
Jun. 30, 2014
Mar. 31, 2014
 [1]
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                        
Revenues from continuing operations $ 147,413 $ 141,553 $ 146,227 $ 146,082 $ 141,765 $ 129,024 $ 127,178 [1] $ 123,758   $ 581,275 $ 521,725 $ 457,111
Income from continuing operations 29,308 106,704 58,590 44,002 19,417 13,168 15,854 10,874 $ 14,935 238,604 59,313 14,935
Income from discontinued operations (2)         12,013 6,135 15,289 [1] 91,058 29,630 [2] 0 [2] 124,495 [2] 29,630 [3]
Net income 29,308 106,704 58,590 44,002 31,430 19,303 31,143 [1] 101,932   238,604 183,808 44,565
Net income attributable to Kilroy Realty Corporation 28,635 104,759 57,500 43,187 30,852 18,982 30,540 [1] 99,845   234,081 180,219 43,880
Preferred dividends and distributions (3,312) (3,313) (3,312) (3,313) (3,312) (3,313) (3,312) [1] (3,313) $ (13,250) (13,250) (13,250)  
Net income available to common stockholders $ 25,323 $ 101,446 $ 54,188 $ 39,874 $ 27,540 $ 15,669 $ 27,228 [1] $ 96,532   $ 220,831 $ 166,969 $ 30,630
Net income (loss) available to common stockholders per share—basic (dollars per share) $ 0.27 $ 1.10 $ 0.61 $ 0.45 $ 0.32 $ 0.18 $ 0.33 [1] $ 1.17 $ 0.37 $ 2.44 $ 1.99 $ 0.37
Net income (loss) available to common stockholders per share—diluted (dollars per share) $ 0.27 $ 1.09 $ 0.61 $ 0.45 $ 0.32 $ 0.18 $ 0.32 [1] $ 1.14 $ 0.37 $ 2.42 $ 1.95 $ 0.37
[1] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the Company's public offerings of common stock and its at-the-market stock offering programs that occurred during the years ended December 31, 2015 and 2014.
[2] (2)The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 2 “Basis of Presentation and Significant Accounting Policies” for additional information). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.
[3] The Operating Partnership adopted ASU 2014-08 effective January 1, 2015 (see Note 2 “Basis of Presentation and Significant Accounting Policies” for additional information). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.