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Indebtedness (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | $ 112,757 | $ 264,796
Purchase Price | 110,667 | 265,858
2011 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased |  | 143,498
Purchase Price |  | 147,723
2011 Exchangeable Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased |  | 18,000
Purchase Price |  | 17,936
2012 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased |  | 82,236
Purchase Price |  | 82,235
2014 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 1,144 | 21,062
Purchase Price | 1,143 | 17,964
2016 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 500 |
Purchase Price | 475 |
2017 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 27,619 |
Purchase Price | 27,506 |
2017 II Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 10,969 |
Purchase Price | 10,182 |
2027 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 7,500 |
Purchase Price | 7,500 |
2028 Notes [Member] |  |
Repurchased And Retired Senior Unsecured Notes Prior To Maturity |  |
Principal Amount Repurchased | 65,025 |
Purchase Price | $ 63,861 |

X
- Definition Principal amount of senior unsecured notes repurchased. + References No definition available. + Details
Name: | fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Purchase price senior unsecured notes. + References No definition available. + Details
Name: | fr_PurchasePriceSeniorUnsecuredNotes
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | fr_RepurchasedAndRetiredSeniorUnsecuredNotesPriorToMaturityAbstract
Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration