Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Document Information, Document [Axis] Document Information, Document [Axis] Security Exchange Name Security Exchange Name Document [Domain] Document [Domain] Entity Address, City or Town Entity Address, City or Town Soliciting Material Soliciting Material Cover page. Cover [Abstract] Legal Entity [Axis] Legal Entity [Axis] City Area Code City Area Code Entity Tax Identification Number Entity Tax Identification Number Amendment Flag Amendment Flag Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Emerging Growth Company Entity Emerging Growth Company Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Entity Address, State or Province Entity Address, State or Province American Assets Trust, L.P. American Assets Trust, L.P. [Member] American Assets Trust, L.P. [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, Address Line One Entity Address, Address Line One Document Information [Line Items] Document Information [Line Items] Document Information [Table] Document Information [Table] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Written Communications Written Communications Entity Address, Address Line Two Entity Address, Address Line Two Local Phone Number Local Phone Number Entity [Domain] Entity [Domain] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Title of 12(b) Security Title of 12(b) Security Document Period End Date Document Period End Date Document Type Document Type