Consolidated Balance Sheets (KILROY REALTY, L.P.) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
REAL ESTATE ASSETS:
Buildings and improvements (Note 2)	$ 3,706,662		$ 3,590,699
Undeveloped land and construction in progress	1,047,371		1,016,757
Total real estate held for investment	5,434,024		5,264,947
Accumulated depreciation and amortization	(854,977)		(818,957)
Total real estate assets held for investment, net ($60,575 and $234,532 of VIE, respectively, Note 1)	4,579,047		4,445,990
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 13)	28,272		213,100
CASH AND CASH EQUIVALENTS	95,534		35,377
RESTRICTED CASH (Notes 1 and 13)	33,717		49,780
MARKETABLE SECURITIES (Note 11)	11,001		10,008
CURRENT RECEIVABLES, NET (Note 4)	11,092		10,743
DEFERRED RENT RECEIVABLES, NET (Note 4)	130,750		127,123
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	188,466		186,622
DEFERRED FINANCING COSTS, NET	15,195		16,502
PREPAID EXPENSES AND OTHER ASSETS, NET	21,469		15,783
TOTAL ASSETS	5,114,543		5,111,028
LIABILITIES:
Secured debt (Notes 5 and 11)	556,946	[1]	560,434	[1]
Exchangeable senior notes, net (Notes 5 and 11)	169,528		168,372
Unsecured debt, net (Notes 5 and 11)	1,431,217		1,431,132
Unsecured line of credit (Notes 5 and 11)	0		45,000
Accounts payable, accrued expenses and other liabilities	187,631		198,467
Accrued distributions (Note 16)	31,456		31,490
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	107,569		101,286
Liabilities of real estate assets held for sale (Note 13)	634		14,447
Total liabilities	2,528,933		2,594,868
COMMITMENTS AND CONTINGENCIES (Note 10)
Partners' Capital (Note 8):
TOTAL LIABILITIES AND EQUITY	5,114,543		5,111,028
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements (Note 2)	679,991		657,491
Buildings and improvements (Note 2)	3,706,662		3,590,699
Undeveloped land and construction in progress	1,047,371		1,016,757
Total real estate held for investment	5,434,024		5,264,947
Accumulated depreciation and amortization	(854,977)		(818,957)
Total real estate assets held for investment, net ($60,575 and $234,532 of VIE, respectively, Note 1)	4,579,047		4,445,990
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 13)	28,272		213,100
CASH AND CASH EQUIVALENTS	95,534		35,377
RESTRICTED CASH (Notes 1 and 13)	33,717		49,780
MARKETABLE SECURITIES (Note 11)	11,001		10,008
CURRENT RECEIVABLES, NET (Note 4)	11,092		10,743
DEFERRED RENT RECEIVABLES, NET (Note 4)	130,750		127,123
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 2 and 3)	188,466		186,622
DEFERRED FINANCING COSTS, NET	15,195		16,502
PREPAID EXPENSES AND OTHER ASSETS, NET	21,469		15,783
TOTAL ASSETS	5,114,543		5,111,028
LIABILITIES:
Secured debt (Notes 5 and 11)	556,946		560,434
Exchangeable senior notes, net (Notes 5 and 11)	169,528		168,372
Unsecured debt, net (Notes 5 and 11)	1,431,217		1,431,132
Unsecured line of credit (Notes 5 and 11)	0		45,000
Accounts payable, accrued expenses and other liabilities	187,631		198,467
Accrued distributions (Note 16)	31,456		31,490
Deferred revenue and acquisition-related intangible liabilities, net (Notes 2 and 3)	107,569		101,286
Rents received in advance and tenant security deposits	43,952		44,240
Liabilities of real estate assets held for sale (Note 13)	634		14,447
Total liabilities	2,528,933		2,594,868
Partners' Capital (Note 8):
Common units, 82,113,491 and 74,926,981 held by the general partner and 1,821,503 and 1,826,503 held by common limited partners issued and outstanding, respectively	2,384,746		2,315,361
Total partners' capital	2,577,157		2,507,772
Noncontrolling interest in consolidated subsidiaries (Notes 2 and 6)	8,453		8,388
Total capital	2,585,610		2,516,160
TOTAL LIABILITIES AND EQUITY	5,114,543		5,111,028
Series G Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners' Capital (Note 8):
Redeemable Preferred stock	96,155		96,155
Series H Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners' Capital (Note 8):
Redeemable Preferred stock	$ 96,256		$ 96,256

[1] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.