Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Legal Entity [Axis] Legal Entity [Axis] Cover [Abstract] Cover [Abstract] Title of 12(b) Security Title of 12(b) Security Federal Realty OP LP Federal Realty OP LP [Member] Federal Realty OP LP Entities [Table] Entities [Table] Local Phone Number Local Phone Number Depository Shares Depository Shares [Member] Depository Shares [Member] Class of Stock [Domain] Class of Stock [Domain] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Entity Address, State or Province Entity Address, State or Province Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Written Communications Written Communications Entity Information [Line Items] Entity Information [Line Items] Trading Symbol Trading Symbol City Area Code City Area Code Common Shares Of Beneficial Interest Common Shares Of Beneficial Interest [Member] Common Shares Of Beneficial Interest [Member] Document Period End Date Document Period End Date Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Entity [Domain] Entity [Domain] Security Exchange Name Security Exchange Name Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company