Business And Organization (Details)	9 Months Ended
Sep. 30, 2015 project
Nature Of Operations [Abstract]
Number of Real Estate Properties	90
Minimum percentage of taxable income distributed to shareholders	90.00%

Minimum percentage of taxable income distributed to shareholders.

No definition available.

Name:	frt_MinimumPercentageOfTaxableIncomeDistributedToShareholders
Namespace Prefix:	frt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration