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Indebtedness - Senior Unsecured Notes Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | $ 29,824
Purchase Price | 33,492
2017 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 430
Purchase Price | 482
2017 II Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 5,000
Purchase Price | 5,300
2028 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 23,394
Purchase Price | 26,547
2032 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 1,000
Purchase Price | $ 1,163

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