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Noncontrolling Interests on the Company’s Consolidated Financial Statements - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) trading_day $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Aug. 30, 2016
Noncontrolling Interest [Line Items]
Conversion ratio	1
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Number of trading days | trading_day	10
Aggregate value upon redemption of outstanding noncontrolling common units	$ 76,200	$ 65,400
Noncontrolling interest in consolidated subsidiary	$ 196,064	$ 197,503
Non-Affiliated Investors | Capital Units
Noncontrolling Interest [Line Items]
Common units outstanding held by common limited partners (in shares) | shares	1,150,574	1,150,574
Kilroy Realty L.P. | Capital Units
Noncontrolling Interest [Line Items]
Common units outstanding held by common limited partners (in shares) | shares	1,150,574	1,150,574
Capital Units | Kilroy Realty L.P.
Noncontrolling Interest [Line Items]
Conversion ratio	1
Operating Partnership
Noncontrolling Interest [Line Items]
Ownership interest (percent)	99.00%	99.00%
Operating Partnership | Non-Affiliated Investors
Noncontrolling Interest [Line Items]
Ownership interest (percent)	1.00%	1.00%
Norges Bank Real Estate Management (NBREM) | Consolidated property partnerships
Noncontrolling Interest [Line Items]
Ownership interest of noncontrolling interest			44.00%
101 First LLC and 303 Second LLC | Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiary	$ 190,700	$ 191,900
Redwood LLC
Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiary	$ 5,400	$ 5,600

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