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Secured and Unsecured Debt of the Operating Partnership - Capitalized Interest and Loan Fees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Interest expense $ 48,537 $ 49,721 $ 66,040
Kilroy Realty L.P. [Member]      
Debt Instrument [Line Items]      
Gross interest expense 129,778 117,789 112,577
Capitalized interest and deferred financing costs (81,241) (68,068) (46,537)
Interest expense $ 48,537 $ 49,721 $ 66,040