Consolidated Statements of Operations (KILROY REALTY, L.P.) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUES:
Rental income	$ 104,939	$ 90,828	$ 308,931	$ 253,599
Tenant reimbursements	9,656	8,022	28,503	21,867
Other property income (Note 10)	1,102	135	7,062	961
Total revenues	115,697	98,985	344,496	276,427
EXPENSES:
Property expenses	25,123	21,016	71,728	55,531
Real estate taxes	10,295	8,746	29,707	23,668
Provision for bad debts	124	0	219	2
Ground leases	929	859	2,665	2,276
General and administrative expenses	10,226	8,727	29,750	26,745
Acquisition-related expenses	568	556	1,387	3,897
Depreciation and amortization	47,569	41,724	141,814	109,780
Total expenses	94,834	81,628	277,270	221,899
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 11)	673	330	1,084	703
Interest expense (Note 5)	(18,853)	(19,854)	(58,021)	(60,172)
Total other (expenses) income	(18,180)	(19,524)	(56,937)	(59,469)
INCOME (LOSS) FROM CONTINUING OPERATIONS	2,683	(2,167)	10,289	(4,941)
DISCONTINUED OPERATIONS (NOTE 12)
Income from discontinued operations (Note 10)	6,344	4,689	10,806	15,603
Net gain on dispositions of discontinued operations	0	0	423	72,809
Total income from discontinued operations	6,344	4,689	11,229	88,412
NET INCOME	9,027	2,522	21,518	83,471
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION	8,896	2,589	21,252	81,763
Preferred distributions			(9,938)	(10,795)
Original issuance costs of redeemed preferred units	0	(2,062)	0	(6,980)
Total preferred distributions	3,312	5,342	9,938	17,775
NET INCOME (LOSS) AVAILABLE TO COMMON STOCKHOLDERS	5,584	(2,753)	11,314	63,988
Loss from continuing operations available to common unitholders per common unit-basic (Note 14)	$ (0.01)	$ (0.10)	$ (0.01)	$ (0.34)
Loss from continuing operations available to common unitholders per common unit-diluted (Note 14)	$ (0.01)	$ (0.10)	$ (0.01)	$ (0.34)
Net income (loss) available to common unitholders per unit-basic (Note 14)	$ 0.07	$ (0.04)	$ 0.13	$ 0.92
Net income (loss) available to common unitholders per unit-diluted (Note 14)	$ 0.07	$ (0.04)	$ 0.13	$ 0.92
Weighted average common units outstanding - basic (Note 14)	76,768,893	71,889,475	75,750,822	67,975,309
Weighted average common units outstanding - diluted (Note 14)	76,768,893	71,889,475	75,750,822	67,975,309
Kilroy Realty, L.P. [Member]
REVENUES:
Rental income	104,939	90,828	308,931	253,599
Tenant reimbursements	9,656	8,022	28,503	21,867
Other property income (Note 10)	1,102	135	7,062	961
Total revenues	115,697	98,985	344,496	276,427
EXPENSES:
Property expenses	25,123	21,016	71,728	55,531
Real estate taxes	10,295	8,746	29,707	23,668
Provision for bad debts	124	0	219	2
Ground leases	929	859	2,665	2,276
General and administrative expenses	10,226	8,727	29,750	26,745
Acquisition-related expenses	568	556	1,387	3,897
Depreciation and amortization	47,569	41,724	141,814	109,780
Total expenses	94,834	81,628	277,270	221,899
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 11)	673	330	1,084	703
Interest expense (Note 5)	(18,853)	(19,854)	(58,021)	(60,172)
Total other (expenses) income	(18,180)	(19,524)	(56,937)	(59,469)
INCOME (LOSS) FROM CONTINUING OPERATIONS	2,683	(2,167)	10,289	(4,941)
DISCONTINUED OPERATIONS (NOTE 12)
Income from discontinued operations (Note 10)	6,344	4,689	10,806	15,603
Net gain on dispositions of discontinued operations	0	0	423	72,809
Total income from discontinued operations	6,344	4,689	11,229	88,412
NET INCOME	9,027	2,522	21,518	83,471
Net income attributable to noncontrolling interests in consolidated subsidiaries	(47)	(48)	(178)	(144)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION	8,980	2,474	21,340	83,327
Preferred distributions	(3,312)	(3,280)	(9,938)	(10,795)
Original issuance costs of redeemed preferred units	0	(2,062)	0	(6,980)
Total preferred distributions	3,312	5,342	9,938	17,775
NET INCOME (LOSS) AVAILABLE TO COMMON STOCKHOLDERS	$ 5,668	$ (2,868)	$ 11,402	$ 65,552
Loss from continuing operations available to common unitholders per common unit-basic (Note 14)	$ (0.01)	$ (0.10)	$ (0.01)	$ (0.34)
Loss from continuing operations available to common unitholders per common unit-diluted (Note 14)	$ (0.01)	$ (0.10)	$ (0.01)	$ (0.34)
Net income (loss) available to common unitholders per unit-basic (Note 14)	$ 0.07	$ (0.04)	$ 0.13	$ 0.92
Net income (loss) available to common unitholders per unit-diluted (Note 14)	$ 0.07	$ (0.04)	$ 0.13	$ 0.92
Weighted average common units outstanding - basic (Note 14)	78,590,396	73,680,259	77,574,907	69,717,834
Weighted average common units outstanding - diluted (Note 14)	78,590,396	73,680,259	77,574,907	69,717,834
Distributions declared per common unit	$ 0.35	$ 0.35	$ 1.05	$ 1.05