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Indebtedness - Senior Unsecured Notes Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | $ 106,303 | $ 112,757
Purchase Price | 110,613 | 110,667
2014 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 9,000 | 1,144
Purchase Price | 9,439 | 1,143
2016 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased |  | 500
Purchase Price |  | 475
2017 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 4,223 | 27,619
Purchase Price | 4,632 | 27,506
2017 II Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased |  | 10,969
Purchase Price |  | 10,182
2027 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased |  | 7,500
Purchase Price |  | 7,500
2028 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 69,680 | 65,025
Purchase Price | 72,541 | 63,861
2032 Notes [Member] |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 23,400 |
Purchase Price | $ 24,001 |

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

X
- 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

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