Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income available to common unitholders	$ 56,608	$ 53,128
Allocation to participating securities	(364)	(413)
Numerator for basic and diluted net income available to common unitholders	$ 56,244	$ 52,715
Denominator:
Basic weighted average vested units outstanding (in shares)	117,059,329	116,650,228
Effect of dilutive securities (in shares)	347,189	409,866
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	117,406,518	117,060,094
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 0.48	$ 0.45
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 0.48	$ 0.45
Kilroy Realty L.P.
Numerator:
Net income available to common unitholders	$ 57,168	$ 53,644
Allocation to participating securities	(364)	(413)
Numerator for basic and diluted net income available to common unitholders	$ 56,804	$ 53,231
Denominator:
Basic weighted average vested units outstanding (in shares)	118,209,903	117,800,802
Effect of dilutive securities (in shares)	347,189	409,866
Diluted weighted average vested shares and common stock/ unit equivalents outstanding (in shares)	118,557,092	118,210,668
Basic earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 0.48	$ 0.45
Diluted earnings per unit:
Net income available to common unitholders per unit (in dollars per share)	$ 0.48	$ 0.45