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Senior Unsecured Notes Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012
Unsecured Senior Notes [Line Items] |
Principal amount repurchased | $ 91,578
Purchase Price | 93,960
2014 Notes [Member] |
Unsecured Senior Notes [Line Items] |
Principal amount repurchased | 9,000
Purchase Price | 9,439
2017 Notes [Member] |
Unsecured Senior Notes [Line Items] |
Principal amount repurchased | 4,223
Purchase Price | 4,632
2028 Notes [Member] |
Unsecured Senior Notes [Line Items] |
Principal amount repurchased | 55,955
Purchase Price | 57,041
2032 Notes [Member] |
Unsecured Senior Notes [Line Items] |
Principal amount repurchased | 22,400
Purchase Price | $ 22,848

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