Consolidated Balance Sheets (KILROY REALTY, L.P.) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
REAL ESTATE ASSETS
Land and improvements	$ 1,108,971	$ 875,794
Buildings and improvements	4,938,250	4,091,012
Undeveloped land and construction in progress	1,013,533	1,361,340
Total real estate assets held for investment	7,060,754	6,328,146
Accumulated depreciation and amortization	(1,139,853)	(994,241)
Total real estate assets held for investment, net	5,920,901	5,333,905
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET	9,417	117,666
CASH AND CASH EQUIVALENTS	193,418	56,508
RESTRICTED CASH	56,711	696
MARKETABLE SECURITIES	14,773	12,882
CURRENT RECEIVABLES, NET	13,460	11,153
DEFERRED RENT RECEIVABLES, NET	218,977	189,704
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	208,368	176,683
PREPAID EXPENSES AND OTHER ASSETS, NET	70,608	27,233
TOTAL ASSETS	6,706,633	5,926,430
LIABILITIES:
Secured debt, net	472,772	380,835
Unsecured debt, net	1,847,351	1,844,634
Accounts payable, accrued expenses and other liabilities	202,391	246,323
Accrued distributions	(222,306)	(34,992)
Deferred revenue and acquisition-related intangible liabilities, net	150,360	128,156
Rents received in advance and tenant security deposits	52,080	49,361
Liabilities and deferred revenue of real estate assets held for sale	56	7,543
Total liabilities	2,947,316	2,691,844
COMMITMENTS AND CONTINGENCIES
Partners' Capital:
TOTAL LIABILITIES AND EQUITY	6,706,633	5,926,430
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS
Land and improvements	1,108,971	875,794
Buildings and improvements	4,938,250	4,091,012
Undeveloped land and construction in progress	1,013,533	1,361,340
Total real estate assets held for investment	7,060,754	6,328,146
Accumulated depreciation and amortization	(1,139,853)	(994,241)
Total real estate assets held for investment, net	5,920,901	5,333,905
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET	9,417	117,666
CASH AND CASH EQUIVALENTS	193,418	56,508
RESTRICTED CASH	56,711	696
MARKETABLE SECURITIES	14,773	12,882
CURRENT RECEIVABLES, NET	13,460	11,153
DEFERRED RENT RECEIVABLES, NET	218,977	189,704
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	208,368	176,683
PREPAID EXPENSES AND OTHER ASSETS, NET	70,608	27,233
TOTAL ASSETS	6,706,633	5,926,430
LIABILITIES:
Secured debt, net	472,772	380,835
Unsecured debt, net	1,847,351	1,844,634
Accounts payable, accrued expenses and other liabilities	202,391	246,323
Accrued distributions	(222,306)	(34,992)
Deferred revenue and acquisition-related intangible liabilities, net	150,360	128,156
Rents received in advance and tenant security deposits	52,080	49,361
Liabilities and deferred revenue of real estate assets held for sale	56	7,543
Total liabilities	2,947,316	2,691,844
COMMITMENTS AND CONTINGENCIES
Partners' Capital:
Common units, shares held by the general partner and shares held by common limited partners issued and outstanding, respectively	3,431,768	3,031,609
Total Partners' Capital	3,624,179	3,224,020
Noncontrolling interests in consolidated subsidiaries	135,138	10,566
Total capital	3,759,317	3,234,586
TOTAL LIABILITIES AND EQUITY	6,706,633	5,926,430
Series G Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners' Capital:
Preferred Units, Preferred Partners' Capital Accounts	96,155	96,155
Series H Cumulative Redeemable Preferred Unit [Member] | Kilroy Realty, L.P. [Member]
Partners' Capital:
Preferred Units, Preferred Partners' Capital Accounts	$ 96,256	$ 96,256