XML 64 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Future Rental Revenues (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Future Rental Revenues [Abstract] |
Minimum lease payments receivable, excluding tenant reimbursements of expenses, under non-cancelable operating leases |
2012 |  | $ | 239,347 |
2013 |  |  | 196,288 |
2014 |  |  | 157,012 |
2015 |  |  | 125,439 |
2016 |  |  | 94,840 |
Thereafter |  |  | 326,295 |
Total |  | $ | 1,139,221 |

X
- Definition Schedule of future minimum rental payments receivable for operating leases. + References No definition available. + Details
Name: | fr_ScheduleOfFutureMinimumRentalPaymentsReceivableForOperatingLeasesTableTextBlock
Namespace Prefix: | fr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration