CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) (Parenthetical) - Common units [Member] - Kilroy Realty L.P. [Member] - shares	Dec. 31, 2019	Dec. 31, 2018
General partner, units issued (in units)	106,016,287	100,746,988
General partner, units outstanding (in units)	106,016,287	100,746,988
Limited partner, units issued (in units)	2,023,287	2,025,287
Limited partner, units outstanding (in units)	2,023,287	2,025,287