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Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	0
Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	(1,089,879)	(290,570)	(241,184)
RSUs granted | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)	401,310
Granted (in shares)	385,718
Vested (in shares)	(250,952)
Settled (in shares)	0
Issuance of dividend equivalents (in shares)	28,519
Forfeited (in shares)	(27,169)
Canceled (in shares)	0
Number of RSUs outstanding, ending balance (in shares)	537,426	401,310
Weighted Average Fair Value Per Share
Outstanding beginning balance ( in dollars per share)	$ 43.86
Granted ( in dollars per share)	36.12
Vested (in dollars per share)	47.15
Settled (in dollars per share)	0
Issuance of dividend equivalents ( in dollars per share)	32.97
Forfeited (in dollars per share)	40.42
Canceled (in dollars per share)	0
Outstanding ending balance (in dollars per share)	$ 36.37	$ 43.86
RSUs granted | Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)	483,443
Granted (in shares)	0
Vested (in shares)	(250,952)
Settled (in shares)	(516,154)
Issuance of dividend equivalents (in shares)	30,216
Forfeited (in shares)	0
Canceled (in shares)	(5,772)
Vested RSUs, ending balance (in shares)	242,685	483,443
RSUs granted | Vested RSUs | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(229,447)
RSUs granted | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)	884,753
Granted (in shares)	385,718
Vested (in shares)	0
Settled (in shares)	(516,154)
Issuance of dividend equivalents (in shares)	58,735
Forfeited (in shares)	(27,169)
Canceled (in shares)	(5,772)
Total RSUs, ending balance (in shares)	780,111	884,753
Market measure-based Restricted Stock Units (RSUs)
Weighted Average Fair Value Per Share
Outstanding beginning balance ( in dollars per share)	$ 52.47
Granted ( in dollars per share)	35.67
Vested (in dollars per share)	53.39
Settled (in dollars per share)	0
Issuance of dividend equivalents ( in dollars per share)	34.67
Forfeited (in dollars per share)	38.64
Outstanding ending balance (in dollars per share)	$ 42.49	$ 52.47
Market measure-based Restricted Stock Units (RSUs) | Nonvested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of RSUs outstanding, beginning balance (in shares)	1,083,086
Granted (in shares)	416,451	483,113	310,484
Vested (in shares)	(702,187)
Issuance of dividend equivalents (in shares)	48,673
Forfeited (in shares)	(17,581)
Number of RSUs outstanding, ending balance (in shares)	828,442	1,083,086
Weighted Average Fair Value Per Share
Granted ( in dollars per share)	$ 35.67	$ 39.65	$ 63.05
Market measure-based Restricted Stock Units (RSUs) | Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested RSUs, beginning balance (in shares)	23,583
Granted (in shares)	354,542
Vested (in shares)	(702,187)
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	33,150
Forfeited (in shares)	(5)
Vested RSUs, ending balance (in shares)	81,274	23,583
Market measure-based Restricted Stock Units (RSUs) | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total RSUs, beginning balance (in shares)	1,106,669
Granted (in shares)	770,993
Vested (in shares)	0
Settled (in shares)	(1,032,183)
Issuance of dividend equivalents (in shares)	81,823
Forfeited (in shares)	(17,586)
Total RSUs, ending balance (in shares)	909,716	1,106,669
Market measure-based Restricted Stock Units (RSUs) | Restricted Stock Units (RSUs) | Kilroy Realty 2006 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(517,475)

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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