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Share-Based and Other Compensation - Summary of Time-Based RSUs (Details) - Time-Based Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vested (in shares)	144,838	208,608	182,219
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)	494,365
Granted (in shares)	172,181	120,769	153,005
Vested (in shares)	118,704
Issuance of dividend equivalents (in shares)	15,587
Forfeited (in shares)	(23,700)
Number of RSUs outstanding, ending balance (in shares)	539,729	494,365
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
RSU weighted average fair value, beginning balance (in dollars per share)	$ 67.97
Weighted average grant date fair value, granted (in dollars per share)	57.83	$ 79.74	$ 70.31
Weighted average grant date fair value, vested (in dollars per share)	71.05
Weighted average fair value, issuance of dividend equivalents (in dollars per share)	67.18
Weighted average fair value, forfeited (in dollars per share)	67.99
RSU weighted average fair value, ending balance (in dollars per share)	$ 64.03	$ 67.97
Vested Restricted Stock Units RSU
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)	1,096,886
Granted (in shares)	0
Vested (in shares)	118,704
Settled (in shares)	(486,941)
Issuance of dividend equivalents (in shares)	26,134
Forfeited (in shares)	0
Canceled (in shares)	(1,710)
Vested RSUs, ending balance (in shares)	753,073	1,096,886
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)	1,591,251
Granted (in shares)	172,181
Vested (in shares)	0
Settled (in shares)	(486,941)
Issuance of dividend equivalents (in shares)	41,721
Forfeited (in shares)	(23,700)
Canceled (in shares)	(1,710)
Total RSUs, ending balance (in shares)	1,292,802	1,591,251
Kilroy Realty 2006 Incentive Award Plan | Vested Restricted Stock Units RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Settled (in shares)	(219,683)

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- Definition

The number of restricted stock units that were issued as dividend equivalents during the period. Restricted stock units issued as dividend equivalents are vested upon issuance.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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