CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]
REVENUES
Rental income (Note 8)	$ 263,208	$ 234,656
Other property income	2,293	990
Total revenues	265,501	235,646
EXPENSES
Property expenses	45,424	38,859
Real estate taxes	25,870	25,266
Ground leases	1,826	1,828
General and administrative expenses (Note 7)	22,781	21,985
Leasing costs	1,013	692
Depreciation and amortization	88,660	75,932
Total expenses	185,574	164,562
OTHER INCOME (EXPENSES)
Interest and other income, net	81	1,373
Interest expense (Note 3)	(20,625)	(22,334)
Gain on sale of depreciable operating property	0	457,288
Total other (expenses) income	(20,544)	436,327
NET INCOME	59,383	507,411
Net income attributable to noncontrolling common units of the Operating Partnership	(516)	(4,886)
Net income attributable to noncontrolling interests in consolidated property partnerships	(5,739)	(4,894)
Total income attributable to noncontrolling interests	(6,255)	(9,780)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 53,128	$ 497,631
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.45	$ 4.27
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.45	$ 4.26
Weighted average common shares outstanding – basic (in shares)	116,650,228	116,344,375
Weighted average common shares outstanding – diluted (in shares)	117,060,094	116,801,384
Kilroy Realty L.P.
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]
REVENUES
Rental income (Note 8)	$ 263,208	$ 234,656
Other property income	2,293	990
Total revenues	265,501	235,646
EXPENSES
Property expenses	45,424	38,859
Real estate taxes	25,870	25,266
Ground leases	1,826	1,828
General and administrative expenses (Note 7)	22,781	21,985
Leasing costs	1,013	692
Depreciation and amortization	88,660	75,932
Total expenses	185,574	164,562
OTHER INCOME (EXPENSES)
Interest and other income, net	81	1,373
Interest expense (Note 3)	(20,625)	(22,334)
Gain on sale of depreciable operating property	0	457,288
Total other (expenses) income	(20,544)	436,327
NET INCOME	59,383	507,411
Total income attributable to noncontrolling interests	(5,739)	(4,894)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 53,644	$ 502,517
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.45	$ 4.27
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.45	$ 4.26
Weighted average common shares outstanding – basic (in shares)	117,800,802	117,494,949
Weighted average common shares outstanding – diluted (in shares)	118,210,668	117,951,958