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Quarterly Financial Information of the Operating Partnership (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from continuing operations $ 147,413 [1] $ 141,553 [1] $ 146,227 [1] $ 146,082 [1] $ 141,765 [1] $ 129,024 [1] $ 127,178 [1] $ 123,758 [1]   $ 581,275 $ 521,725 $ 457,111
Income from continuing operations 29,308 [1] 106,704 [1] 58,590 [1] 44,002 [1] 19,417 [1] 13,168 [1] 15,854 10,874 [1] $ 14,935 238,604 59,313 14,935
Income from discontinued operations (2)         12,013 [1] 6,135 [1] 15,289 [1] 91,058 [1] 29,630 [2] 0 [2] 124,495 [2] 29,630 [3]
Net income 29,308 [1] 106,704 [1] 58,590 [1] 44,002 [1] 31,430 [1] 19,303 [1] 31,143 [1] 101,932 [1]   238,604 183,808 44,565
Net income attributable to the Operating Partnership 28,635 [1] 104,759 [1] 57,500 [1] 43,187 [1] 30,852 [1] 18,982 [1] 30,540 [1] 99,845 [1]   234,081 180,219 43,880
Preferred distributions (3,312) [1] (3,313) [1] (3,312) [1] (3,313) [1] (3,312) [1] (3,313) [1] (3,312) [1] (3,313) [1] $ (13,250) (13,250) (13,250)  
Net income available to common stockholders $ 25,323 [1] $ 101,446 [1] $ 54,188 [1] $ 39,874 [1] $ 27,540 [1] $ 15,669 [1] $ 27,228 [1] $ 96,532 [1]   $ 220,831 $ 166,969 $ 30,630
Net income (loss) available to common stockholders per share—basic (dollars per share) $ 0.27 [1] $ 1.10 [1] $ 0.61 [1] $ 0.45 [1] $ 0.32 [1] $ 0.18 [1] $ 0.33 [1] $ 1.17 [1] $ 0.37 $ 2.44 $ 1.99 $ 0.37
Net income (loss) available to common stockholders per share—diluted (dollars per share) $ 0.27 [1] $ 1.09 [1] $ 0.61 [1] $ 0.45 [1] $ 0.32 [1] $ 0.18 [1] $ 0.32 [1] $ 1.14 [1] $ 0.37 $ 2.42 $ 1.95 $ 0.37
Kilroy Realty, L.P. [Member]                        
Revenues from continuing operations $ 147,413 [1] $ 141,553 [1] $ 146,227 [1] $ 146,082 [1] $ 141,765 [4] $ 129,024 [4] $ 127,178 [4] $ 123,758 [4]   $ 581,275 $ 521,725 $ 457,111
Income from continuing operations 29,308 [4] 106,704 [4] 58,590 [4] 44,002 [4] 19,417 [4] 13,168 [4] 15,854 10,874 [4]   238,604 59,313 14,935
Income from discontinued operations (2)         12,013 [4] 6,135 [4] 15,289 [4] 91,058 [4]   0 [3] 124,495 [3] 29,630
Net income 29,308 [4] 106,704 [4] 58,590 [4] 44,002 [4] 31,430 [4] 19,303 [4] 31,143 [4] 101,932 [4]   238,604 183,808 44,565
Net income attributable to the Operating Partnership 29,052 [4] 106,640 [4] 58,518 [4] 43,927 [4] 31,371 [4] 19,244 [4] 31,066 [4] 101,867 [4]   238,137 183,548 44,341
Preferred distributions (3,312) [4] (3,313) [4] (3,312) [4] (3,313) [4] (3,312) [4] (3,313) [4] (3,312) [4] (3,313) [4]   (13,250) (13,250) (13,250)
Net income available to common stockholders $ 25,740 [4] $ 103,327 [4] $ 55,206 [4] $ 40,614 [4] $ 28,059 [4] $ 15,931 [4] $ 27,754 [4] $ 98,554 [4]   $ 224,887 $ 170,298 $ 31,091
Net income (loss) available to common stockholders per share—basic (dollars per share) $ 0.27 [4] $ 1.10 [4] $ 0.61 [4] $ 0.45 [4] $ 0.32 [4] $ 0.18 [4] $ 0.33 [4] $ 1.17 [4]   $ 2.44 $ 1.99 $ 0.37
Net income (loss) available to common stockholders per share—diluted (dollars per share) $ 0.27 [4] $ 1.09 [4] $ 0.61 [4] $ 0.45 [4] $ 0.31 [4] $ 0.18 [4] $ 0.32 [4] $ 1.14 [4]   $ 2.42 $ 1.94 $ 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.
[4] 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 unitholders per unit does not equal the annual number reported on the consolidated statements of operations due to the impact of 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.