CONSOLIDATED BALANCE SHEETS (KILROY REALTY, L.P.) (Parenthetical) - Common units [Member] - Kilroy Realty L.P. [Member] - shares	Dec. 31, 2020	Dec. 31, 2019
General partner, units issued (in units)	116,035,827	106,016,287
General partner, units outstanding (in units)	116,035,827	106,016,287
Limited partner, units issued (in units)	1,150,574	2,023,287
Limited partner, units outstanding (in units)	1,150,574	2,023,287