CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
REAL ESTATE ASSETS:
Land and improvements	$ 1,506,357	$ 1,466,166
Buildings and improvements	5,997,523	5,866,477
Undeveloped land and construction in progress	2,318,236	2,296,130
Total real estate assets held for investment	9,822,116	9,628,773
Accumulated depreciation and amortization	(1,622,369)	(1,561,361)
Total real estate assets held for investment, net	8,199,747	8,067,412
CASH AND CASH EQUIVALENTS (Note 4)	762,134	60,044
RESTRICTED CASH	16,300	16,300
MARKETABLE SECURITIES (Note 10)	19,984	27,098
CURRENT RECEIVABLES, NET	16,534	26,489
DEFERRED RENT RECEIVABLES, NET	352,352	337,937
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	204,392	212,805
RIGHT OF USE GROUND LEASE ASSETS (Note 9)	96,145	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 2)	67,559	55,661
TOTAL ASSETS	9,735,147	8,900,094
LIABILITIES:
Secured debt, net (Notes 3 and 10)	257,359	258,593
Unsecured debt, net (Notes 3, 10 and 15)	3,050,103	3,049,185
Unsecured line of credit (Notes 3 and 10)	380,000	245,000
Accounts payable, accrued expenses and other liabilities	417,547	418,848
Ground lease liabilities (Note 9)	98,247	98,400
Accrued dividends and distributions (Note 15)	57,620	53,219
Deferred revenue and acquisition-related intangible liabilities, net	130,843	139,488
Rents received in advance and tenant security deposits	65,913	66,503
Total liabilities	4,457,632	4,329,236
COMMITMENTS AND CONTINGENCIES (Note 9)
Stockholders’ Equity (Note 4):
Common stock, $.01 par value, 150,000,000 shares authorized, 115,067,924 and 106,016,287 shares issued and outstanding, respectively	1,151	1,060
Additional paid-in capital	5,067,181	4,350,917
Distributions in excess of earnings	(76,182)	(58,467)
Total stockholders’ equity	4,992,150	4,293,510
Noncontrolling Interests (Notes 1 and 5):
Common units of the Operating Partnership	87,655	81,917
Noncontrolling interests in consolidated property partnerships	197,710	195,431
Total noncontrolling interests	285,365	277,348
Total equity	5,277,515	4,570,858
TOTAL LIABILITIES AND EQUITY (CAPITAL)	9,735,147	8,900,094
Kilroy Realty L.P. [Member]
REAL ESTATE ASSETS:
Land and improvements	1,506,357	1,466,166
Buildings and improvements	5,997,523	5,866,477
Undeveloped land and construction in progress	2,318,236	2,296,130
Total real estate assets held for investment	9,822,116	9,628,773
Accumulated depreciation and amortization	(1,622,369)	(1,561,361)
Total real estate assets held for investment, net	8,199,747	8,067,412
CASH AND CASH EQUIVALENTS (Note 4)	762,134	60,044
RESTRICTED CASH	16,300	16,300
MARKETABLE SECURITIES (Note 10)	19,984	27,098
CURRENT RECEIVABLES, NET	16,534	26,489
DEFERRED RENT RECEIVABLES, NET	352,352	337,937
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET	204,392	212,805
RIGHT OF USE GROUND LEASE ASSETS (Note 9)	96,145	96,348
PREPAID EXPENSES AND OTHER ASSETS, NET (Note 2)	67,559	55,661
TOTAL ASSETS	9,735,147	8,900,094
LIABILITIES:
Secured debt, net (Notes 3 and 10)	257,359	258,593
Unsecured debt, net (Notes 3, 10 and 15)	3,050,103	3,049,185
Unsecured line of credit (Notes 3 and 10)	380,000	245,000
Accounts payable, accrued expenses and other liabilities	417,547	418,848
Ground lease liabilities (Note 9)	98,247	98,400
Accrued dividends and distributions (Note 15)	57,620	53,219
Deferred revenue and acquisition-related intangible liabilities, net	130,843	139,488
Rents received in advance and tenant security deposits	65,913	66,503
Total liabilities	4,457,632	4,329,236
COMMITMENTS AND CONTINGENCIES (Note 9)
Noncontrolling Interests (Notes 1 and 5):
Common units, 115,067,924 and 106,016,287 held by the general partner and 2,021,287 and 2,023,287 held by common limited partners issued and outstanding, respectively (Note 6)	5,074,003	4,369,758
Noncontrolling interests in consolidated property partnerships and subsidiaries (Note 1)	203,512	201,100
Total capital	5,277,515	4,570,858
TOTAL LIABILITIES AND EQUITY (CAPITAL)	$ 9,735,147	$ 8,900,094