DEBT - Narrative (Details) | | | | | | 6 Months Ended | | |
Jan. 05, 2023 USD ($) extension | Jan. 05, 2022 USD ($) extension | Jan. 26, 2021 USD ($) | Jan. 09, 2019 extension | Jan. 09, 2018 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jan. 04, 2023 USD ($) | Jan. 14, 2022 interest_rate_swap_agreement |
Debt Instrument [Line Items] | | | | | | | | | |
Repayment of unsecured term loan | | | | | | $ 150,000,000 | $ 0 | | |
Repayments of line of credit | | | | | | 36,000,000 | 0 | | |
Unsecured line of credit, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Maximum leverage ratio of revolving credit facility | | 60% | | | | | | | |
Maximum secured leverage ratio on revolving credit facility | | 40% | | | | | | | |
Minimum fixed charge coverage ratio covenant threshold | | 1.50 | | | | | | | |
Minimum unsecured leverage ratio | | 175% | | | | | | | |
Maximum unsecured leverage ratio | | 60% | | | | | | | |
Maximum recourse indebtedness of total asset value | | 15% | | | | | | | |
Third Amended and Restated Credit Facility | Unsecured line of credit, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Percentage annual distributions cannot exceed funds from operations | | 95% | | | | | | | |
American Assets Trust, L.P. | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Repayment of unsecured term loan | | | | | | 150,000,000 | 0 | | |
Repayments of line of credit | | | | | | $ 36,000,000 | $ 0 | | |
American Assets Trust, L.P. | Unsecured term loans, net | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Minimum base rate | 0% | | | | | | | | |
American Assets Trust, L.P. | Unsecured term loans, net | Federal Funds Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 0.50% | | | | | | | | |
American Assets Trust, L.P. | Unsecured term loans, net | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 1% | | | | | | | | |
American Assets Trust, L.P. | Unsecured term loans, net | Minimum | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 1.20% | | | | | | | | |
American Assets Trust, L.P. | Unsecured term loans, net | Maximum | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 1.90% | | | | | | | | |
American Assets Trust, L.P. | Unsecured line of credit, net | Minimum | Secured Overnight Financing Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 1.05% | | | | | | | |
American Assets Trust, L.P. | Unsecured line of credit, net | Maximum | Secured Overnight Financing Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 1.50% | | | | | | | |
American Assets Trust, L.P. | 3.375% Senior Unsecured Notes | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Stated Interest Rate | | | 3.375% | | | | | | |
Note offering percent | | | 0.98935 | | | | | | |
Weighted average yield of investment | | | 3.502% | | | | | | |
Proceeds from debt, net of issuance costs | | | $ 489,700,000 | | | | | | |
American Assets Trust, L.P. | 3.375% Senior Unsecured Notes | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Face amount of debt | | | 500,000,000 | | | | | | |
Stated Interest Rate | | | | | | 3.375% | | | |
American Assets Trust, L.P. | Senior Guaranteed Notes, Series A | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Repayment of unsecured term loan | | | 150,000,000 | | | | | | |
Loss on early extinguishment of debt | | | (3,900,000) | | | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | | | | $ 450,000,000 | | | | |
Additional borrowing capacity | | | | | 250,000,000 | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | | | | $ 100,000,000 | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Federal Funds Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 0.50% | | | 0.50% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 1% | | | | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Minimum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.30% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Minimum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.30% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Maximum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.90% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured term loans, net | Maximum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.90% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Repayments of line of credit | | | $ 100,000,000 | | | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | | | | $ 350,000,000 | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | Minimum | London Interbank Offered Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.05% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | Minimum | Base Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.10% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | Maximum | London Interbank Offered Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.50% | | | | |
American Assets Trust, L.P. | Second Amended and Restated Credit Facility | Unsecured line of credit, net | Maximum | Base Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.50% | | | | |
American Assets Trust, L.P. | Term Loan B | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Term of debt instrument | | | | | 7 years | | | | |
American Assets Trust, L.P. | Term Loan B | Minimum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.70% | | | | |
American Assets Trust, L.P. | Term Loan B | Maximum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.35% | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | First year | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Derivative fixed interest rate | 5.47% | | | | | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Second year | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Derivative fixed interest rate | 5.57% | | | | | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Minimum base rate | | | | | 0% | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Federal Funds Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 0.50% | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Eurodollar | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1% | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Minimum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.20% | | | | |
American Assets Trust, L.P. | Term Loan B | Unsecured term loans, net | Maximum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | | 1.70% | | | | |
American Assets Trust, L.P. | Term Loan B & Term Loan C | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Debt extension options | extension | 1 | | | | | | | | |
Extension term | 12 months | | | | | | | | |
American Assets Trust, L.P. | Term Loan B & Term Loan C | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Face amount of debt | $ 225,000,000 | | | | $ 150,000,000 | | | $ 150,000,000 | |
Debt extension options | extension | 1 | | | | | | | | |
Extension term | 12 months | | | | | | | | |
American Assets Trust, L.P. | Term Loan B & Term Loan C | Unsecured term loans, net | Minimum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 0.20% | | | | | | | | |
American Assets Trust, L.P. | Term Loan B & Term Loan C | Unsecured term loans, net | Maximum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | 0.90% | | | | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Minimum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 0.20% | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Maximum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 0.70% | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Debt extension options | extension | | | | 3 | | | | | |
Extension term | | | | 1 year | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Unsecured term loans, net | Federal Funds Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 0.50% | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Unsecured term loans, net | Eurodollar | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 1% | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Unsecured term loans, net | Minimum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 1.20% | | | | | |
American Assets Trust, L.P. | First Amendment To Second Amended And Restated Credit Facility | Unsecured term loans, net | Maximum | London Interbank Offered Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | | | 1.70% | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | $ 500,000,000 | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Interest Rate Swap | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Derivative fixed interest rate | | | | | | | | | 2.70% |
Number of interest rate swap agreements | interest_rate_swap_agreement | | | | | | | | | 2 |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Debt extension options | extension | | 2 | | | | | | | |
Extension term | | 6 months | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | $ 100,000,000 | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Minimum base rate | | 1% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | Minimum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 0.20% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | Minimum | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 1.20% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | Maximum | Base Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 0.70% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured term loans, net | Maximum | Secured Overnight Financing Rate | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 1.70% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured line of credit, net | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Debt issuance costs, net, revolving credit facility | | | | | | $ 1,600,000 | | | |
Weighted average interest rate, revolving credit facility | | | | | | 5.96% | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured line of credit, net | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Revolving credit facility borrowing limit, maximum borrowing capacity | | $ 400,000,000 | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured line of credit, net | Minimum | Base Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 0.10% | | | | | | | |
American Assets Trust, L.P. | Third Amended and Restated Credit Facility | Unsecured line of credit, net | Maximum | Base Rate | Revolving Credit Facility | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | |
Basis spread on variable rate | | 0.50% | | | | | | | |