v3.25.4
Secured and Unsecured Debt of the Operating Partnership - Unsecured Senior Notes - Registered Offerings and Private Placement (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total secured debt $ 592,685 $ 598,199
Unamortized deferred financing costs (9,150) (12,692)
Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Long-term debt, gross 4,625,442  
Total secured debt 592,685 598,199
Long-term debt 4,589,459  
Secured debt | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Total secured debt 600,442 606,688
Unamortized deferred financing costs (7,757) (8,489)
Long-term debt 592,685 598,199
3.57% Mortgage Payable due December 2026 | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Long-term debt, gross $ 148,800  
3.57% Mortgage Payable due December 2026 | Secured debt | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Stated Coupon Rate 3.57%  
GAAP effective rate 3.80%  
Long-term debt, gross $ 148,815 152,668
4.48% Mortgage Payable due July 2027 | Secured debt | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Stated Coupon Rate 4.48%  
GAAP effective rate 4.57%  
Long-term debt, gross $ 76,627 79,020
5.90% Mortgage Payable due August 2034 | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Long-term debt, gross $ 375,000  
5.90% Mortgage Payable due August 2034 | Secured debt | Kilroy Realty L.P.    
Debt Instrument [Line Items]    
Stated Coupon Rate 5.90%  
GAAP effective rate 6.13%  
Long-term debt, gross $ 375,000 $ 375,000